c. The adult size of wheat midge is very small and it is not easy to find. How can we grasp the timing to prevent and control the wheat midge in time, and it will not cause a decrease in wheat production?
According to the experience of controlling midge insects, adult wheat midge insects will spawn on the wheat ears from late April to early May each year, and the larvae will invade the panicle after hatching for harm. Because the lifespan of the midge is only 3-5 days, the time required for the field to control adult worms is tight, and the timing of prevention and control is difficult to grasp. Leakage prevention and loss of time often occur. Therefore, the key to determining the prevention and control of adults is timely control of the occurrence of midge damage.
Generally adopt the "two look and two set" method, that is to say the proper control of adult pests; look at the number of wheat ear pest control plots.
The specific method is: Before the early-maturing varieties start to head until late-maturing varieties are grouted, the selected representative plots are surveyed every 1-2 days. During the survey, we squatted down in the wheat ridge and put forward with both hands. Gently pry the wheat plant to both sides and observe the number of adult take-offs. If one can see 2-3 adults taking off, it is the beginning of the adult period. Or use a net with a diameter of 33 cm and a length of 1 meter to catch 10 nets every day in the ears of wheat before and after sunset every day in the afternoon to catch more than 10 adults. This is the beginning of adult emergence, which means that pesticides must be used for control.
The prevention of wheat midge insects, generally 70% of wheat ears in the heading stage of wheat begin to show, combined with the forecast of insect conditions in sunny days without wind before sunset 80% of dichlorvos emulsion 50-100 ml, add water 500 ml, mix 25 kg dry Fine soil (can not be too dry or too wet), spread in the wheat field after mix well, you can also mix 2-3 kilograms of wheat bran, stack 40 small piles, even against two. If there is wind available dichlorvos, dimethoate 1500 times spray control, attention must not exceed the wheat flowering period. The best spraying is 7-10 hours a day, 15-18 hours.
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