Fruit tree moss control method
Fruit tree mites are small, adaptable and fast. Only by understanding its characteristics, grasping the critical period, and using pesticides scientifically can we achieve economic and effective purposes.
I. Characteristics of fruit tree mites The moderate temperature and drought is an important factor in the occurrence of mites. When the temperature is around 12 °C, the mites grow at the same temperature, and increase at 16 °C. When it is above 20 °C, it is affected at 28 °C. Suppression; relative humidity 60-70% is the most suitable, heavy rain has a greater erosion and elimination effect on mites. The ape generation has a short duration. In the peak period, it takes 14-16 days to complete a generation, including 5-6 days for the egg period, 2 days for the young, and 5-6 days for the sputum, about 1.5 days before the spawning period. There are many algebras in the genus, and the life span of the female pupa is 5-28 days. There is a serious overlap of the generations of the former adult and the descendants. Most of the mites are overwintered by eggs and mites in the back of the leaves. When the weather turns warm after the spring, the wintering eggs appear in the incubation period. After the spring shoots turn green, a large number of insects are damaged from the autumn shoots last year. The second peak is often caused by disasters during the flowering period, causing leaves and affecting the fruit setting rate. When the autumn shoot turned to the green period, the density of the mites increased again, and the second peak appeared.
The distribution of common red spiders shifts with the order of shoots. Eggs are mostly produced on leaves, fruits and young leaves, with more leaves on both sides of the main veins of the leaves.
2. Resistance problems of mites According to the China Pesticide Network , the resistance of mites varies with different regions, different fields and different periods of the same field. The resistance of different insects in the mites is also different. The newly hatched larvae have the weakest resistance, and the sputum and sputum are more resistant, and the obtained drug resistance is multi-generation. There are many reasons for the emergence of drug resistance: in a region, long-term, large-area, single use of the same pesticide is easy to make cockroaches resistant; unreasonably high concentration of drugs, frequency is too frequent, interval is too short, cockroaches Produce a huge selection pressure, forcing it to produce mutations and produce drug resistance faster; it is also prone to drug resistance during the peak period of Cheng and Ruo. Therefore, these problems should be noted in the prevention and treatment of chemicals.
Third, grasping the key period of drug use when the base of the mites are low, the drug can be controlled for a long period of time, that is, the first generation of insects and the early hatching of the eggs after the winter is the best period for drug control. At this time, mites are the weakest.
The four key periods for the control of apple mites are: (1) the initial flowering period; (2) the half-month period after the flowering; (3) the peak period from the end of June to August; (4) the hatching period of the wintering egg.
In particular, at present, most fruit farmers ignore the prevention and control of mites in autumn and winter, and the prevention and control of mites in autumn is also the center of the year. The control effect is good or bad, affecting the number of wintering crickets and egg bases. It affects the size of the occurrence of mites in the second year.
Fourth, choose low-cost, high-effect acaricides to prevent red spiders in time.
Tips for China Pesticide Network : According to the performance, characteristics and control objects of pesticides, spray according to the concentration and precautions of different fruit trees, ensure the quality when spraying, and be meticulous, uniform, hit the target, and achieve the best defense. effect. It must be noted that the use of copper preparations will stimulate the growth and reproduction of mites, causing a rapid increase in the density of worms.
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