How to control wheat aphids? Three measures to improve control effectiveness
Wheat aphids are one of the main pests currently harming @#@245@#@. In recent years, due to changes in climatic conditions, a decrease in the number of natural enemies, and improper control measures in wheat fields, the harm caused by wheat aphids has become increasingly serious, resulting in reduced wheat yield and declining quality. In response to farmers' situations in controlling wheat aphids, taking the following three measures can improve the control effectiveness of wheat aphids.
Determine whether to control based on the control threshold. The control threshold for wheat aphids is 500 aphids per 100 ears. As long as a field reaches the control threshold, pesticide control should be applied immediately. Controlling according to the control threshold can not only effectively control the harm of wheat aphids to wheat, but also achieve the purpose of saving pesticide and labor. Never wait until wheat aphids cover the wheat ears before starting control, otherwise the control effectiveness will be affected because control is too late.
Alternate pesticides to reduce wheat aphid resistance. Commonly using a certain pesticide will cause wheat aphids to develop resistance to the pesticide used, thereby making the control effectiveness worse. It is recommended that in the early stage of aphid occurrence, use 40 grams of 21% lüsha per mu, or 25 grams of 2.5% zeta-cypermethrin, or 50 milliliters of 3% acetamiprid emulsifiable concentrate; in the middle and late stages of aphid occurrence, use 8-10 grams of 50% pirimicarb wettable powder, or 20-30 grams of 10% imidacloprid wettable powder. The above pesticides have special effects on aphids and are basically harmless to the natural enemies of aphids. Alternating use can significantly improve the control effectiveness.
Appropriately increase the amount of water used. Some farmers use an unscientific amount of water when applying pesticides. For example, when controlling wheat aphids on 1 mu of wheat, they add the pesticide into 1 sprayer of water (a sprayer holds about 15 kg of water) for control. As a result, the pesticide solution cannot be evenly sprayed on all plants in the wheat field, causing aphids on plants that received no pesticide or little pesticide to continue surviving and reproducing, resulting in secondary damage. The amount of water used should be appropriately increased according to the spraying equipment. When applying pesticide with a manual sprayer, the water consumption per mu should be no less than 50 kg; when applying pesticide with an electric backpack sprayer, the water consumption per mu should be no less than 40 kg; when applying pesticide with a motorized mist sprayer, the water consumption per mu should be no less than 20 kg, and it should be sprayed evenly and thoroughly from top to bottom to ensure the control effectiveness.