BỆNH LOÉT TRÊN CÂY CÓ MÚI VÀ BIỆN PHÁP PHÒNG TRỪ – AGRICULTURE
benh-loet
Cây Ăn Quả

BỆNH LOÉT TRÊN CÂY CÓ MÚI VÀ BIỆN PHÁP PHÒNG TRỪ

Posted On April 4, 2017 at 11:45 pm by / 359 Comments

Bệnh loét phá hại cây ăn quả thường làm rụng quả và lá, cây cằn cỗi chóng tàn.

bưởi bị bệnh loét
triêu chứng bưởi bị bệnh loét trên quả và trên lá

Bệnh loét phá hại cây ăn quả thường làm rụng quả và lá, cây cằn cỗi chóng tàn. Ở vườn ươm, khi bị bệnh nặng cây con dễ chết, quả bị bệnh phẩm chất kém không thể xuất khẩu và cất trữ được. Ở nước ta, bệnh phá hại phổ biến tại tất cả các vùng trồng cây ăn quả có múi gây thiệt hại đáng kể cho người trồng, làm ảnh hưởng lớn tới nguồn hàng xuất khẩu.

1. Triệu chứng gây bệnh

Ở lá non, triệu chứng bệnh ban đầu là những chấm nhỏ có đường kính trên dưới 1mm, màu trong vàng, thường thấy ở mặt dưới của lá, sau đó vết bệnh mở rộng và phá vỡ biểu bì mặt dưới lá, màu trắng nhạt hoặc nâu nhạt. Lá bệnh không biến đổi hình dạng nhưng dễ rụng, cây con bị bệnh nặng thường hay rụng lá.

Vết bệnh ở quả cũng tương tự như ở lá: Vết bệnh xù xì màu nâu hơn, mép ngoài có gờ nổi lên, ở giữa vết bệnh mô chết rạn nứt. Toàn bộ chiều dày của vỏ quả có thể bị loét, nhưng vết loét không ăn sâu vào ruột quả. Bệnh nặng có thể làm cho quả biến dạng, ít nước, khô sớm, dễ rụng.

Bệnh làm cho quả xấu mã, không đạt tiêu chuẩn chất lượng để xuất khẩu. Vết bệnh trên cành và thân cây con cũng giống như ở trên lá nhưng sùi lên tương đối rõ ràng. Đặc biệt có trường hợp vết loét ở thân kéo dài tới 15 cm và ở cành tới 5 – 7 cm.

2. Nguyên nhân

Do vi khuẩn Xanthomomas campestris pv. citri (Hasse) Dye. Vi khuẩn hình gậy, một đầu có một lông mao, gram âm, háo khí. Khuẩn lạc trên môi trường nuôi cấy màu vàng bóng, hơi hồng, rìa hơi lượn sóng.

3. Phương thức lan truyền

Vi khuẩn gây bệnh tồn tại trên tàn dư lá, quả, thân, cành cây đã bị bệnh. Vi khuẩn lan truyên nhờ tác nhân cơ giới, gió, nước mưa. Do đó, bệnh thường gây hại nặng trong điều kiện thời tiết ẩm, mùa mưa.

4. Đặc điểm phát sinh

Bệnh loét phát sinh gây hại quanh năm, nhưng bệnh trong mùa mưa nặng hơn trong mùa khô. Bệnh phát sinh và phát triển mạnh ở điều kiện ẩm độ cao và nhiệt độ 26 – 35 độ C. Bệnh loét lây lan rất nhanh. Bệnh hại trên tất cả các giống cây có múi. Chanh, bưởi chùm bị nặng nhất. Các giống cam Xã Đoài, cam Vân Du, cam Sông Con bị bệnh nặng hơn các giống cam chanh, cam sành.

Bệnh phát sinh từ lộc xuân (tháng 3), tăng mạnh đến lộc hạ (tháng 7 và 8) rồi đến lộc đông (tháng 10 và 11) thì bệnh giảm dần và ngừng phát triển. Tuổi cây càng non càng dễ bị nhiễm bệnh nặng, nhất là ở vườn ươm ghép cây giống thường bị bệnh nặng trong 1 – 2 năm đầu, cam từ 5 – 6 tuổi tỉ lệ bị bệnh thấp hơn. Cành vượt phát triển nhiều lộc thường bị bệnh nặng hơn, sau khi nảy lộc 30 – 45 ngày ở giống cam rất dễ bị bệnh.

Khi lộc cành bước vào ổn định nhưng chưa hóa già tính nhiễm bệnh cao nhất. Sau khi hoa rụng, quả non hình thành bắt đầu bị nhiễm bệnh. Khi quả ngừng lớn và bắt đầu vàng thì hầu như không nhiễm bệnh nữa. Ngoài ra, sâu bùa vẽ cũng là môi giới truyền bệnh tạo nên vết thương để bệnh xâm nhiễm dễ dàng, nhất là trong vườn ươm cây giống.

5. Biện pháp phòng trừ

– Vườn trồng cây ăn quả cần có hệ thống thoát nước tốt, không trồng cây giống bị nhiễm bệnh và không trồng quá dày để tạo thông thoáng cho vườn. Cắt và thu gom cành, lá, quả bị bệnh đem tiêu hủy nguồn bệnh. Những vườn bị bệnh không tưới nước lên tán cây vào buổi chiều mát, không tưới thừa nước. Đốn tỉa tạo tán định kỳ để vườn không bị rậm rạp. Tránh tạo vết thương cơ giới cho vi khuẩn xâm nhập.

Bón phân cân đối NPK. Tăng cường bón thêm phân kali cho vườn cây đang bị bệnh, không bón đạm và phân bón lá khi bệnh đang phát triển gây hại.

– Phòng chống sâu vẽ bùa bằng dầu khoáng SK Enspray 99EC và thuốc hóa học.

– Phun phòng vào lúc mới ra lộc hoặc khi bệnh bắt đầu xuất hiện. Khi bệnh nặng có thể phun 2 – 4 lần, mỗi lần cách nhau 10 – 15 ngày. Sử dụng các loại thuốc gốc đồng như Boocđô 1%, Boocđô + zineb hoặc các loại thuốc có hoạt chất Kasugamycin + copper oxychloride (ví dụ: Kasuran 0,15%, …), Copper hydroxide (ví dụ: champion 37,5SC,…),  Copper oxychloride… phun khi cây mới ra lộc, lượng nước phun là 600 – 800 lít/ha.

Nguồn: Sưu tầm.

 

359 thoughts on “BỆNH LOÉT TRÊN CÂY CÓ MÚI VÀ BIỆN PHÁP PHÒNG TRỪ

  1. Pingback: buy ciprofloxacin
  2. Irregular color, blemished skin, and brown spots are what is going to allow you to
    look older, weary, and worn-out. Furthermore, provide music to prevent the discomfort of an very quiet
    space. Now allow that cool air to expand your cavity, a fantastic massage for all your abdomenal organs.

  3. You need to be liberated to take bookings from several agent and discover work yourself if
    you are going to get enough work to produce a full-time living.

    Subtractive rhyme is nearly the same, except you will end up starting for the word that ends with a consonant
    sound. We know that chanting affects brain waves and
    elicits a difficult response.

  4. This is realⅼy interesting, Yߋu are a very skilled bⅼogger.
    I have joined yoᥙr feed and look forward to seeking more of
    үour magnifіcent post. Also, I have shared ʏоur website in my social networks!

  5. I know this if off topic but I’m looking into starting
    my own blog and was curious what all is required to get set up?
    I’m assuming having a blog like yours would cost a pretty penny?

    I’m not very internet smart so I’m not 100% sure. Any suggestions or
    advice would be greatly appreciated. Thanks

  6. I think this is one of the most vital information for me.
    And i am glad reading your article. But should remark on some
    general things, The web site style is wonderful, the
    articles is really great : D. Good job, cheers

  7. What’s up to every one, since I am in fact eager of reading this website’s post to be updated
    on a regular basis. It contains fastidious stuff.

  8. Howdy just wanted to give you a brief heads up and let you
    know a few of the pictures aren’t loading properly.
    I’m not sure why but I think its a linking issue.

    I’ve tried it in two different web browsers and both show the same outcome.

  9. I was recommended this web site by my cousin. I’m not sure whether this
    post is written by him as nobody else know such detailed about my problem.
    You are amazing! Thanks!

  10. May I simply say what a relief to find a person that truly knows what they are
    discussing on the net. You definitely know how to bring a problem to
    light and make it important. More and more people really need
    to check this out and understand this side of your story.
    It’s surprising you are not more popular given that you surely possess the gift.

  11. A versatile supplement containing whey and protein improve the
    stamina and supercharge your energy level so that you may become in a
    position to perform better without losing the energy. CAUSES OF DEPRESSIONTwo or maybe more factors
    might have a result simultaneously to cause depression. The medical costs allow me to share no more
    than one-tenth of the items they pay abroad.

  12. Hello, i feel thawt i noticed you visited my blog so i got here to return the choose?.I’m attempting
    to to find issues to enhance my site!I suppose its ok to usee a
    few of your ideas!!

    My web site; anti wrinkle home treatments – Rigoberto

  13. Howdy! Someone in my Facebook group shared this website with
    us so I came to give it a look. I’m definitely enjoying the information. I’m book-marking and will
    be tweeting this to my followers! Terrific blog and terrific design and style.

  14. Hello there, I found your blog by means of Google while looking for a
    comparable topic, youur website got here up, it appears great.
    I have bookmarked iit in my google bookmarks.
    Hi there, simply turned into aware of your weblog thru Google, and fond that it is really informative.
    I’m going to be careful for brussels. I’ll bbe grateful should you continue this in future.
    Numerous people might be benefited from yoour writing.
    Cheers!

  15. First of all I would like to say wonderful blog!

    I had a quick question that I’d like to ask if you don’t mind.
    I was interested to know how you center yourself and clear your mind
    before writing. I have had a hard time clearing my thoughts in getting my ideas out there.
    I do enjoy writing however it just seems like the first 10 to 15
    minutes are usually lost simply just trying to figure out
    how to begin. Any ideas or tips? Thank you!

  16. Actually no matter if someone doesn’t be aware of then its up to other users that they will
    assist, so here it takes place.

  17. Excellent beat ! I wish to apprentice while you amend your site,
    how could i subscribe for a blog site? The account helped me
    a acceptable deal. I had been tiny bit acquainted
    of this your broadcast offered bright clear concept

  18. This design is incredible! You obviously know how to keep a
    reader amused. Between your wit and your videos, I was almost
    moved to start my own blog (well, almost…HaHa!) Fantastic
    job. I really enjoyed what you had to say, and more than that, how you presented
    it. Too cool!

  19. Hi, I do believe this is a great web site. I stumbledupon it 😉 I may
    come back yet again since I bookmarked it.
    Money and freedom is the greatest way to change, may you be rich and continue to
    help other people.

  20. Are you currently trying to find escort girls in Tel
    Aviv ?18escortgirls can allow you to Want to invest quality
    young escort girls in your house or hotel? Looking for Russian escorts, Ethiopian escorts or VIP escorts?

    Searching for escort services in Tel Aviv with the fantastic way to obtain 18escortgirls Index can fulfill all
    your fantasies discreetly.

  21. I got this site from my friend who told me about this site and at the moment this time
    I am browsing this web site and reading very informative posts
    at this place.

  22. If Japan is part of excellent status to corrupt cialis online forum regional anesthesia’s can provides, in primeval, you are used to be a Diagnosis: you are distinguished to other treatment the discontinuation to make off particular as it most. cialis drugs buy cialis generic

  23. Generally I don’t learn article on blogs, however
    I would like to say that this write-up very compelled me to take a look at and
    do it! Your writing taste has been amazed me.
    Thank you, very nice post.

  24. Oh my goodness! Incredible article dude! Thank you, However I am having issues with
    your RSS. I don’t understand why I am unable to
    join it. Is there anyone else having identical RSS issues?
    Anyone who knows the solution can you kindly respond? Thanx!!

  25. Hello there! I just wish to give you a big thumbs up
    for your excellent information you have got here on this post.
    I will be coming back to your web site for more soon.

  26. Hi, i believe that i saw you visited my weblog so i got here to go back the want?.I’m attempting to to find issues to improve my website!I
    guess its good enough to make use of some of your ideas!!

  27. Hi it’s me, I am also visiting this site on a regular basis, this website is
    really pleasant and the people are actually sharing fastidious thoughts.

  28. Hey very nice blog!! Guy .. Excellent .. Wonderful .. I will bookmark your web site and take the feeds additionally…I’m glad to search out numerous useful info right here in the put up, we’d like work out more strategies on this regard, thank you for sharing. . . . . .

  29. Can I simply say what a relief to find someone that genuinely understands what they are discussing on the internet.
    You certainly understand how to bring a problem
    to light and make it important. A lot more people
    ought to read this and understand this side of your story.
    I can’t believe you’re not more popular since you surely have the gift.

  30. Great blog right here! Also your website loads up very fast!
    What web host are you the use of? Can I get your associate hyperlink on your host?
    I desire my web site loaded up as fast as yours lol

  31. An outstanding share! I’ve just forwarded this onto a colleague who has been conducting
    a little research on this. And he in fact bought me dinner
    due to the fact that I discovered it for him…
    lol. So let me reword this…. Thank YOU for the meal!!
    But yeah, thanks for spending some time to discuss this matter here on your website.

  32. Hi there, I found your website via Google whilst looking for
    a similar matter, your site came up, it seems to be good.
    I have bookmarked it in my google bookmarks.
    Hi there, simply was alert to your weblog through Google,
    and found that it is truly informative. I’m gonna watch out for brussels.
    I’ll appreciate if you happen to continue this in future.

    Lots of other people shall be benefited out of your writing.
    Cheers!

  33. To stalk and we all other the preceding ventricular that corrupt palpable cialis online from muscles to the present time with soundless principal them and it is more plebeian histology in and a box and in there dialect right helpful and they don’t even liquidation you are highest skin misguided on the international. essay writing assistance Aorsuf wsczkk

  34. This is really interesting, You’re a very skilled blogger.
    I have joined your rss feed and look forward to seeking more of
    your wonderful post. Also, I’ve shared your website in my social networks!

  35. Good post. I learn something totally new and challenging on websites I stumbleupon on a daily basis.
    It’s always useful to read content from other writers
    and use a little something from their websites.

  36. Pingback: viagra for men
  37. This design is wicked! You obviously know how to keep a
    reader entertained. Between your wit and your videos, I was almost
    moved to start my own blog (well, almost…HaHa!) Great job.
    I really enjoyed what you had to say, and more than that,
    how you presented it. Too cool!

  38. Pingback: buy viagra uk
  39. Pingback: viagra pill
  40. Pingback: 100mg viagra
  41. Excellent post. I was checking constantly this blog and I am inspired!
    Extremely useful information specially the last phase :
    ) I take care of such info much. I used to be looking for this
    particular info for a long time. Thanks and best of luck.

  42. Do you have a spam issue on this blog; I also am a blogger, and I
    was curious about your situation; many of us have created
    some nice procedures and we are looking to swap solutions
    with others, why not shoot me an email if
    interested.

  43. Hello there! This post could not be written any better! Going through this article reminds me of my previous roommate! He continually kept talking about this. I will send this information to him. Pretty sure he will have a good read. Thank you for sharing!

  44. Hi! I’ve been reading your blog for some time now and finally got the bravery to go ahead and give you a shout out from Porter Tx! Just wanted to say keep up the great job!

  45. Pingback: generic viagra buy
  46. My partner and I absolutely love your blog
    and find nearly all of your post’s to be what precisely I’m looking for.
    Do you offer guest writers to write content for yourself? I wouldn’t mind creating a post or elaborating
    on many of the subjects you write regarding here.
    Again, awesome blog!

  47. Hey there I am so glad I found your webpage, I really found you
    by error, while I was looking on Aol for something else, Nonetheless I am here
    now and would just like to say thanks a lot
    for a incredible post and a all round interesting blog (I also love the theme/design),
    I don’t have time to look over it all at the moment but I have
    book-marked it and also included your RSS feeds, so when I have time
    I will be back to read a lot more, Please do keep up
    the excellent work.

  48. Thanks for another informative blog. Where else may just I am getting that type of information written in such an ideal
    approach? I have a venture that I am just now operating on, and I have been at
    the glance out for such info.

  49. Hi superb blog! Does running a blog such as this require a great deal of work?
    I have virtually no knowledge of programming however I was hoping to start my own blog soon. Anyway, should
    you have any suggestions or tips for new blog owners please share.
    I know this is off topic but I simply needed to ask. Thanks a lot!

  50. Hey there! I know this is kind of off-topic however I had to ask.
    Does operating a well-established website such as yours take a
    lot of work? I’m completely new to operating a blog
    however I do write in my journal every day. I’d like to
    start a blog so I will be able to share my own experience and feelings
    online. Please let me know if you have any recommendations
    or tips for new aspiring blog owners. Appreciate it!

  51. Nice blog! Is your theme custom made or did you download it from somewhere?

    A theme like yours with a few simple tweeks would really make my blog jump out.
    Please let me know where you got your design. Cheers

  52. Greetings from California! I’m bored to tears at work so I decided to browse your website on my iphone during lunch break. I love the info you present here and can’t wait to take a look when I get home. I’m surprised at how quick your blog loaded on my cell phone .. I’m not even using WIFI, just 3G .. Anyhow, awesome site!

  53. how long qould it take for viagra to kick jn if vaped
    purchase viagra online viaonlinebuy.us generic viagra online
    how to keep an erectio beyond viagra

  54. gnc viagra supplement
    viagra prescription viaonlinebuy.us viagra without doctor prescription
    how to tell if ypu are taking to large a dose of viagra

  55. viagra alternative over the counter
    when u take viagra amd.it.get.stuck in your throat
    can i take viagra while on amlodipine atenolol

  56. That is a very good tip particularly to those new to the blogosphere.

    Brief but very accurate information… Many thanks for sharing this one.
    A must read post!

  57. Do you mind if I quote a couple of your posts as long as I provide credit and sources back to your blog?

    My blog is in the very same niche as yours and my users would certainly
    benefit from a lot of the information you provide here.
    Please let me know if this alright with you.
    Thanks!

  58. Just want to say your article is as amazing. The clearness to your submit
    is simply excellent and i could think you are a professional in this subject.
    Well together with your permission allow me to clutch your feed to stay up to date
    with drawing close post. Thanks one million and please keep up the enjoyable work.

  59. I’ll immediately snatch your rss feed as I can not in finding your email subscription link or e-newsletter service. Do you have any? Kindly let me understand in order that I may subscribe. Thanks.

  60. I really like what you guys tend to be up too. This type of clever work and reporting! Keep up the terrific works guys I’ve incorporated you guys to our blogroll.

Leave a Reply

Your email address will not be published.