Pomegranate is a major pest of the pomegranate family, Lepidoptera. The larvae jeopardize the shoots and perennial branches, resulting in debilitating tree vigor. The yield and quality of the fruit are reduced, and the entire plant dies. The worms occur in all pomegranate producing areas in the country, and their occurrence rules and control methods are described below.
1 The law of occurrence
The worms occur in Shandong for one generation a year, and the larvae overwinter in the damaged shoots. Overwintering larvae began their activities in the spring of the second year and continued to feed on the branches. After the larvae became mature in late May, a hole was opened on the shoots (mostly above the branch bifurcation), and the larvae were cleared in a 1 cm tunnel under the feathering hole. The feathering began in mid-June 20 d in the flood season, July. In the first half of the year, the emergence period was high and the emergence of birds was completed in early August. Adults are hidden on the back of the pomegranate branches during the day and are active at night. 1 to 2 days after copulation, spawning can be started, eggs can be laid continuously for 2 to 3 days, and the eggs are scattered in small pieces or in a single piece, prolific in the shoots at the tip of the shoot, and the egg period is 10 to 15 days in early July. At the beginning of hatching, the newly hatched larvae enter the new shoots from the buds and shoots, along the medullary part of the tunnel straight down and open a row of fecal holes at a certain distance. After 3 to 5 days, the victim was wilted and easily found. As the larvae grow up, the tunnels deepen and widen downwards, and the defecation holes go further and further, until the winter dormancy has reached the 2-year-old branch. After the resumption of activity the following year, it will continue to be harmful, and it can reach 3 years old.
2 control methods
1 kills larvae. During the active period of larvae, insecticides are injected from fresh boreholes, sealed with mud and poisoned, and sealed with poisonous or aluminum phosphide tablets. 2 spray control. During the hatching period of larvae, 2.5% to 30% deltamethrin may be sprayed, and 800-1000 times of enemies mixture may be sprayed, or 15% to 1 200 times of 50% dichlorvos EC may be sprayed, or other insecticides and ovicidal pesticides. Excellent control effect. 3 Cut off the diseased branches. After germinating in the spring, undying dead branches are completely cut off to eliminate the overwintered larvae or cockroaches therein. In July, it was found that the shoot was cut off in time. Combine the winter cut, cut off the worm branch and burn it.
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