Küresel: Colorado böceği, piretroidlere karşı hayatta kalmayı başardı, saha uygulamalarında ölüm oranı %0-55'e düştü.
Anahtar teslim paketler
- 69 beetle populations tested in Czechia from 2017 to 2022
- 0–55.2% mortality with lambda-cyhalothrin at field rate
- 3,132 was the top acetamiprid resistance ratio recorded
- 1 chemistry class per generation, 1 in 4 generations max
Neden önemli
- Çiftçiler için
- Her böcek nesli için IRAC grubuna göre bir ilaçlama planı yazın ve dört nesil içinde birden fazla nesle karşı aynı ilaç sınıfını kullanmayın.
- İşlemciler için
- Sözleşmeli yetiştiricilerden böcek ilaçlama rotasyon planlarını isteyin, çünkü ilaçlamaların başarısız olması yaprak dökülmesine ve daha küçük yumrulara yol açar.
- Tedarikçiler için
- Check local resistance data before recommending pyrethroids or neonicotinoids for beetle control and offer a rotation partner for diamides
60 saniyelik özet
Many Colorado potato beetle populations no longer die from the doses farmers apply, so the choice of insecticide group now decides whether a spray pays. A Czech team followed 69 populations for six years. With the pyrethroid lambda-cyhalothrin, kill rates stayed between zero and about 55%, and chlorpyrifos did little better. Acetamiprid worked well on some farms and failed on others, with a resistance ratio of up to 3,132. Chlorantraniliprole still killed at least 86.7% of beetles. Cornell extension advice turns this into a rule: one chemical class per generation, and each class against no more than one generation in four. Several neonicotinoid brands share IRAC Class 4, so swapping labels does not count as rotating. The limitation is geography: the tests covered Czech populations only, and resistance differs between regions, so local testing is the safest guide before a spray programme is fixed.
Colorado potato beetle populations can survive standard insecticide doses, a six-year study from Czechia shows. Researchers tested 69 beetle populations between 2017 and 2022. The results were published in the journal PLOS ONE on 6 May 2024.
The pyrethroid lambda-cyhalothrin gave very low mortality at the recommended field rate. Mortality ranged from 0% to 55.2% between populations. No population sensitive to this active ingredient was found. The organophosphate chlorpyrifos gave 0% to 64.3% mortality in tests from 2017 to 2020. Again, the authors recorded no sensitive population.
Neonicotinoids gave mixed results. Mortality with acetamiprid ranged from 3.3% to 100%. The resistance ratio between populations reached 3,132. For thiamethoxam, mortality ranged from 79.3% to 100%, with resistance ratios from 2.3 to 28.6. The diamide chlorantraniliprole remained effective. Mortality was 86.7% to 100% in tests from 2020 to 2022, and the authors saw no loss of sensitivity.
Hafta içi. Tek tıkla abonelikten çıkın.
Rotation by beetle generation
Extension guidance from Cornell University in the United States gives a simple rule. Only one class of chemistry should be used against a single beetle generation. Each class should be used against only one generation out of every four on a farm.
The guidance notes that about two dozen products are available for beetle control. They span more than eleven classes of chemistry. So a real rotation is possible on most farms.
Cornell also warns about one group in particular. Many neonicotinoid products belong to the same IRAC Class 4. Switching between brand names within this class is not a rotation. The guidance adds that one imidacloprid product had been used on some farms every year since 1995.
Neden önemli
The beetle adapts fast when the same mode of action is used year after year. The Czech data show that older pyrethroids and organophosphates may no longer control many populations. Growers who still rely on them may pay for sprays that do little.
A written rotation plan by IRAC group is the practical answer. Farms should record which group was used against each generation. Local resistance tests, like those in the Czech study, show which groups still work in a given region. The diamide result is good news, but it also shows which group needs the most protection now.
Önleme ve kontrol · Editör notu
Colorado potato beetle (Leptinotarsa decemlineata): what growers can do
- önleme: Rotate fields away from last year’s potatoes and control volunteer patates.
- İzleme: Scout for egg masses; treat small larvae at the local threshold.
- Kimyasal koruma: Chlorantraniliprole (IRAC 28), spinosad (IRAC 5), pyrethroids (IRAC 3A), neonicotinoids (IRAC 4A; not approved for field use in the EU and UK). Check the national register of your country.
- Direnç yönetimi: Use each IRAC group against only one beetle generation per season. Do not repeat group 4A after a seed-tuber treatment.
Bu not, yalnızca bilgilendirme amacıyla potatoes.news editör ekibi tarafından sağlanmıştır. Herhangi bir şirketin tavsiyesi niteliğinde değildir ve zorunlu değildir. Yalnızca ülkenizde onaylanmış bitki koruma ürünlerini kullanın ve etiket talimatlarına uyun. Ürün adları ve tescilleri ülkeler arasında farklılık gösterir; yerel bir ziraat mühendisine danışın.
Photo: Colorado potato beetle on a potato plant (illustrative). Hélène Rival / Vikipedi, CC BY-SA 4.0
Küresel Patates Özeti
En önemli beş haber, fiyatlar, hastalık uyarıları ve etkinlikler. Hafta içi sabahları, reklamsız.
kaynaklar
- PLOS ONE — Six-year monitoring of pesticide resistance in the Colorado potato beetle during a neonicotinoid restriction period (Kocourek et al., 6 May 2024) — https://pmc.ncbi.nlm.nih.gov/articles/PMC11073731/
- Cornell University, B. Nault — Control of Colorado Potato Beetle & Insecticide Resistance Management — https://rvpadmin.cce.cornell.edu/pdf/submission/pdf54_pdf.pdf
Bu materyalde bağlantılıdır.
- Ülke
- Dünya
- Şirketler
- Cornell University; PLOS ONE
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