There are many aphids on watermelon. What should we do at this moment?

When summer comes, it is also the season when watermelons are ripe in large quantities. Watermelon is welcomed by many people for its sweetness, freshness and rich juice. When I discussed with farmers how to choose watermelons, farmer Lao Yang had no intention of eating melons. As a watermelon grower, the output of watermelon he planted last year was actually. I asked Lao Yang why the output was so low. Is there less water and fertilizer? He said that because there are too many aphids, it can't be cured with pesticides, and listening to others will spread the virus. The leaves rolled into a ball, half of the seedlings died, and there was almost no yield.

aphids are a headache for many farmers' friends, whether they are planting vegetables or fruits. As farmers say, after a large number of aphids occur, the whole leaf will curl up by sucking juice from the back of the leaf and the front is still the same length. The growth of melon seedlings needs leaves to make photosynthetic substances, and the damaged leaves will directly affect the growth of melon seedlings. Aphids can not only directly harm leaves, but also spread viruses. Once infected with the virus, watermelon can't blossom and bear fruit normally, reducing the yield.

Therefore, in order to produce watermelon with high yield and high quality, it is also a key problem to control aphids. No matter what crops are planted, when spraying pesticides, we should combine agricultural control, strengthen field management and effectively kill pests. We can start from the following aspects.

1. Reduce the source of insects

Weeds in the field are hiding places for some pests. Weeds in the greenhouse should be removed before planting, and a layer of weed control cloth should be covered to reduce the source of insects.

2. hanging yellow boards

aphids are very sensitive to yellow, so they can hang yellow boards in the greenhouse, which will stick to aphids during migration. Moreover, the yellow board can not only prevent aphids, but also trap and kill whiteflies. The hanging height of the yellow board is also special, which can be adjusted according to the height of the plant, generally 5~1 cm above the plant. In addition, there should be insect nets in the greenhouse to prevent aphids from entering the greenhouse.

3. Chemical control

There are also many pesticides to control aphids, such as imidacloprid, thiamethoxam and pymetrozine. If a single pesticide is used, aphids will develop drug resistance, which is why many farmers say that it is effective for the first time, but it cannot be cured after repeated use. Therefore, compound pesticides should be selected and used alternately. You can use pymetrozine plus nitenpyram plus moroxydine hydrochloride or thiamethoxam plus nitenpyram plus lentinan. Morphine hydrochloride and lentinan can prevent viral diseases and achieve the effect of multiple prevention with one spray.

spray evenly when spraying, and also spray on the back of leaves. When using pesticides, silicone additive can also be added to make the liquid medicine adhere to the surface of plants, so that the control effect will be better. I hope that farmers and friends can start with the above three methods when preventing aphids, and early detection and prevention will achieve the best control effect.