Evaluation bifenazate 24% SC in control of Panonychus ulmi in apple orchards of Iran

Subject Areas : entomology and othea arthropods

Masoud Arbabi ¹ , D. Shirdel ² , M. taghizadeh ³ , h. rahimi ⁴ , Gh. A. Akbarzadeh-Shokat ⁵

1 - موسسه تحقیقات گیاه پزشکی کشور
2 - مرکز تحقیقات کشاورزی و منابع طبیعی استان آذربایجان شرقی
3 - پژوهش مرکز تحقیقات کشاورزی و منابع طبیعی استان آذربایجان شرقی
4 - عضو هیات علمی و مربی پژوهش در مرکزتحقیقات کشاورزی ومنابع طبیعی خراسان رضوی (مشهد)
5 - Assistant professor in Agric. Res. Cent and National Resources of West Azarbijan province

Received: 2020-07-08 Accepted : 2020-09-23 Published : 2020-11-21

Keywords:

Abstract :

Effects bifenazate 24% SC doses (0.5 0.6, 0.7. ml/l) evaluated with spirodiclofen SC 240, fenazaquin  SC 20%, fenproximate 5% SC 5%, fenpropatrin, 10% FL on active stages of  Panonychus ulmi on red apple variety in East (Marand), West Azerbaijan (Oromia), Ardebil (Meshkeinshar) and Khorasan Razavi (Golmakan) provinces during 2010 . Blocked randomized design with three replications used and each replicate consisted four apple trees. Treatment done when mean of 5 mobile mite stages observed in 30% apple leaves collected randomly. Effects fo each treatment carried out by collection of 50 apples leaves and alive mite counted on upper leaf surface at one day before and 7, 14, 21 and 28 days accordingly. Mean active stages of P. ulmi mite/leaf found varied between 3.01 to 7.78 mites, 6.70 to 28.15mites, 3 to 36.66 mites and 17.43 to 26.83 mite among treatments in West Azerbaijan, Khorasan Razavi, East Azerbaijan and Ardebil respectively.  Highest mite mortality% threated by bifenazate doses up to 21 days after recorded 98.33% and 94.85% for 0.7 and 5 ml/l in Oromia and Golmakan, up to 14 and 7 days after observed 99.9% and 68.71% for 0.7 ml/l of bifenazate in  Marand and Meshkeinshar respectively. Bifenazate toxicity on mean of recorded natural enemies (predatory mites, Orius sp, and Thrips sp.) in Meshkeinshar reduced their number but did not eliminate them from apple trees. Higher doses of bifenazate application when mean of P. ulmi recorded lest than 5 mites on 30% of collected leaves, will provide effective control.