Control of resistant aphids in Wheat

(Agricultural Wealth Network) It is more and more difficult to control wheat resistant aphids. We introduce the control techniques as follows in combination with breeding experience:

1. There are many pesticides to control wheat aphids, such as imidacloprid, acetamiprid, aphid mist, fenvalerate, beta-cypermethrin, omethoate, dichlorvos, phoxim, malathion, and their compound preparations. Advocate the use of high efficiency, low toxicity, systemic action of the drug. In the production, the most important choice of pesticides is to select qualified pesticides. Some products on the market now have insufficient active ingredient content. If farmers are greedy for cheap prices, the effect of medication will definitely not be ideal.

2. Pay attention to the prevention and control of wheat aphids before wheat flowering. The aphids begin to occur from wheat turning green, and are always in a slow growth period before wheat heading and flowering; after wheat flowering, the occurrence increases sharply. If serious control can be done before flowering, the population of aphids will be difficult to recover in a short time, and the damage of aphids in the whole growth period can be basically controlled. At the same time, it can also treat wheat midges. At this stage, wheat has not yet grown to normal plant height, and it is easier to control, and the control effect is good.

Third, increase the amount of water Water is the carrier of the pesticide, through the appropriate amount of water can be sprayed to the various parts of the field wheat. Insufficient water consumption leaves room for aphids. In the late stage of wheat growth, due to the high temperature, it is very suitable for aphid growth and reproduction, even 5~7 days can complete a generation, if due to insufficient water and leave residual insects, its occurrence number can be imagined, for the future control increased difficulty. The leaf layer of wheat is thick at grain filling stage, and water consumption should be increased when controlling it.

4. The compound preparation used in wheat filling stage Under normal circumstances, wheat aphid control once before flowering can basically ensure that wheat is not harmed. If for some reason aphids occur in large numbers during the grain filling stage, some compound preparations can be used. Wheat filling stage plants have grown to normal plant height, usually not easy to penetrate, can be used with dichlorvos (about 50 ml per mu) mixed with other pesticides, play the role of dichlorvos fumigation, can play a better control effect. Alternate use of other pesticides can also improve control effectiveness.

V. Using different control methods In the late stage of wheat growth, the common problem in controlling aphids is that aphids in the upper part of the plant regress after application, while aphids in the lower part are difficult to die, and aphids are harmful in the upper part a few days later. In this case, in addition to using compound preparations, fumigation can also be used to control aphids in the lower part of wheat plants. Can use 40% dimethoate emulsifiable concentrate 50~75 ml, or 80% dichlorvos 75~100 ml, diluted with 2~3 kg of water, mixed with fine sand soil 15~25 kg, in the evening when there is no wind scattered into the field.

VI. Reduce the number of pesticides In order to give full play to the control role of natural enemies, it is necessary to understand the occurrence law of wheat aphids and understand the insecticidal performance of pesticides; at the appropriate time, select appropriate pesticides and control them with correct methods. Try to use low-toxicity and high-efficiency pesticides, reduce the frequency of application, protect all kinds of natural enemies in wheat fields, and give full play to the role of natural enemies in controlling aphids.