Scientific control of soybean aphids
Soybean aphids are commonly known as greasy worms and honey worms. It is mainly concentrated on the growth point of soybean, the top leaf and the back of young leaves, and the harm of sucking juice. It can not only cause leaf curl, plant dwarfing, reduce yield, but also spread virus disease, resulting in yield and quality decline. The insect began to appear in the soybean field in the middle and late June, and the damage was serious during high temperature and drought.
Soybean aphids have great reproductive capacity, and a female can reproduce 50-60. Under suitable conditions, small aphids can give birth in about 4-5 days, and can reproduce 15 generations on soybean in the whole year.
There are four peaks of migration and spread of soybean aphids in the whole year, the first in soybean seedling stage, the second in early June, the third in mid-July and the fourth in early September. Generally speaking, the prevention and control should be carried out in the first ten days of July.
Prevention and control methods: give priority to chemical control, use 40% dimethoate EC 800x, or 40% omethoate EC 1000 times. 10% deltamethrin EC 15-20 ml per 667 square meters, 50% aldicarb wettable powder 10 grams per 667 square meters, 40-50 kg spray with water.
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Prevention and treatment of soybean deficiency
The expression of lack of trace elements in soybean is as follows: the true leaves of spring soybean are yellow, which can be yellowed from the bottom up, there are parallel continuous or discontinuous iron patches along the veins of the compound leaves, and chlorosis extends from the tip of the leaves to the base, so that the whole leaves are light yellow, and the veins of the leaves are also green; the leaves are small and thin, easy to fall off, the stems are slender, the lower leaves of the plant are dark green, thick, uneven and long; when the scale deficiency is serious, the veins are yellowish brown, and then the whole leaves are yellow. The potassium deficiency leaves yellowed and the symptoms developed from the lower leaves to the upper leaves; the leaf margin began to produce chlorotic spots and spread.
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Control measures of Cotton aphids in the Yellow River Basin
Aphids, also known as greasy insects and honey insects, are one of the main pests on cotton in China. Cotton aphids damaged in cotton fields can be divided into seedling aphids and summer aphids. Seedling aphids occur before emergence to budding, and the temperature is suitable for low temperature. when the temperature exceeds 27 ℃, the reproduction is inhibited and the insect population decreases rapidly. aphids that often occur from early July to mid-August are called "summer aphids". On the 3rd, the average temperature is 2428 ℃ and the relative humidity is 55% and 85%, which is beneficial to the proliferation of "aphids". The weather when it is sunny and rainy is the most suitable for the breeding of "aphids".
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