I. Plutella xylostella and cabbage worms
1. Degree of occurrence: The occurrence degree of Plutella xylostella and Pieris rapae is expected to be 3.
2. Main basis: According to a survey conducted on May 10, the pest rate was 85%, the number of 100 P. xylostellas was 200, and the number of eggs was 215; the cabbage insects had 516 P. albinos Eggs up to 587 grains.
3. Analysis of causes: 1 The harvest of rapeseed field caused great shift of cabbage caterpillar to the cruciferous crop of vegetables. 2 In the “double rush†season of farming, the prevention and control did not pay attention, creating an environment for the occurrence of pests.
4. Prevention and control measures: 1 Light trapping adult insects; 2 Chemical control: 5% CPT, 5% stuck grams of emulsifiable concentrate, 2.5% Uranus EC, plus 2 bags of Xianyi leaf foliar fertilizer spray per acre.
Second, potato ladybug
1, the degree of occurrence: the degree of ladybugs to 2 levels.
2. Main basis: According to a survey conducted on May 13th, the pest rate was 65%, and the damage rate was 10%.
3. Prevention and control measures: 3% of Mobilan EC, 5% of cypermethrin, and 10% of Sai Le is mainly used for prevention and control of pesticides.
Third, the tobacco powder
According to field investigations, the amount of insect population in Bemisia tabaci is relatively low, and the population of insect population will increase after the end of May. It should be noted that prevention and control agents should be used as follows: Biphenylacetacin, propylene glycol alginate.
In addition, the pesticide content of the liquid sprayer in the motorized sprayer is low and the control effect is poor. Pesticides are better formulated with mother liquor.
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