Plutella xylostella is one of the main pests on rape. The rapeseed in the Central and Central Jiangsu region can occur from 3 to 4 generations in a lifetime and overlap in generations. When the temperature rises above 12°C (from March to April), it is the peak of the hazard. When rape seedlings have 8 to 10 leaves, field inspections should be performed. When the larvae reach more than 20 heads per square meter, the drug should be used for prevention and treatment, and 2 to 3 consecutive treatments should be used. The instar larvae of Plutella xylostella are resistant to insecticides, and care should be taken to alternate the use of drugs to delay drug resistance. In egg hatching period to larval 2nd instar period, it can be used to spray 2.5% of spinosad suspension 1000-1500 times or Sitacla 5% chlorfluazuron EC to 1000-2000 times liquid. In the larvae of the 2nd to 3rd instars, it is possible to use rifadin 2 0.9% avermectin EC 2000 times or Kemet 35% AVX EC 2000 times, or to dilute 10% chlorfenapyr Suspending agent 1500 ~ 3000 times liquid spray. In March, the diamondback moth just experienced cold winter and its physical quality was weak. At this time, the use of pesticides can significantly reduce the population of insect populations throughout the year. Efficient and low-toxic biological pesticides such as avermectin and insect growth regulator pesticides, Bt preparations, etc., have the best effect before and after the evening. In Yangzhou, Plutella xylostella has been highly resistant to 2.5% deltamethrin EC (enemy) and other pyrethroid pesticides, and should be avoided or reduced. After more than 10 leaves or convulsions of oilseed rape, the liquid volume per acre should be increased to 1.5 barrels (conventional sprayer barrels); when the seedling height is 60 cm, the leafy leaves should be flourishing, spraying should be thorough, meticulous and uniform. The leaves on the back and near the ground are fully drugged.
Henan Qianli Machinery CO. Ltd is a profession manufacture of Farm Tractor, rice machine, Reaper Machine, Power Tiller, garden machine and other farm implements. Our factory was established in 1987 and has more than 30 years of production and sales experience. We focus on providing customers with high-quality products and excellent services.
The Riding Mower has a powerful gas Engine and is suitable for large yard operations. And the back of the seat is located in the middle of the user's back to provide extra comfort.