How to control wheat aphids more scientifically? A detailed guide to practical methods

Wheat aphids are @#@245@#@ the type of pest with the largest annual occurrence area and the most severe damage. Although wheat aphids occur and cause damage year after year, farmers still have some misunderstandings in their control. How can wheat aphids be controlled more scientifically? It is recommended to pay attention to the following three points:

1. The appropriate time to start control. In general years, the appropriate time to start controlling wheat aphids (when the number of aphids per 100 plants rises to 500) is after wheat flowering (before grain filling), generally around May 5. Starting control at this time is best. As long as the right pesticide is used and the dosage meets the requirements, generally one control treatment can solve the damage.

2. The time to end control. From many years of control experience, 20 days before wheat maturity (late grain filling or early dough stage), that is, around May 25, spraying to control wheat aphids should be stopped. During this period, even if the aphid population is relatively large, the environmental conditions in all respects are no longer suitable for wheat aphid occurrence, and even without control, the number of wheat aphids will decline rapidly.

3. The choice of control pesticides. At present, there are three most ideal pesticides for controlling wheat aphids: imidacloprid, acetamiprid, and pirimicarb. When choosing pesticides for wheat aphid control, these three pesticides should be used alternately. It should be noted that many pesticide products now have a wide variety of trade names. When purchasing, check carefully whether the active ingredient stated on the label is one of imidacloprid, acetamiprid, or pirimicarb. Matrine is a botanical pesticide and can be selected, but its effectiveness is not very stable. Although pyrethroid pesticides are not highly toxic pesticides, because of their relatively strong killing effect on natural enemies, it is recommended not to use them. Omethoate and dimethoate are highly toxic and moderately toxic organophosphorus pesticides, and they should also be avoided as much as possible. As for highly toxic organophosphorus pesticides such as methyl 1605, 1605, methamidophos, and monocrotophos, they are not suitable, and since January 1, 2007, their use has also been completely prohibited, so they especially must not be selected.