Does your orchard have this symptom?
Some fruit farmers have reported that the branches of fruit trees in recent years have been frequently harmed by a type called “Tian Tian Niuâ€, and the frequency of occurrence has increased. Here, we will explain the occurrence and control of everyone.
The fruiting peasant said that "Cyclodia cylindrica", whose scientific name is "Pigoptera moth," belongs to the order Lepidoptera. It differs not only from the larva body color (the larvae body color is red) but also from S. tianchiensis. The bigger difference is that it is harmed from the lower end of the fruit tree to the tip of the tree, resulting in serious dead branch cutting. .
Occurrence
One generation occurs every year. The mature larvae live in winter in the branches of fruit trees, and winter larvae begin to phlegm at the end of April and early May of the following year. The adult eclosion occurred from May to June. Before the beginning of July, the larva first attacked the young shoots in the same year. The larvae in the branches of the branches threw into a tunnel, and the tunnel with the growth of the insect body gradually expanded and prolonged. Severely hindered the transfer of tree nutrients, resulting in the death of upper trunk. After 10 months, the larvae enter the mature stage and they build an overwintering room in the damaged branches for wintering.
Prevention
1. In autumn and winter, when it is found that there are dead branches, they should be cut off in time and burned in a concentrated manner to eliminate overwintering larvae.
2. Emergence period is a critical period for drug control, while in May and June it is the fruit bagging period, which is not convenient for the application of EC pesticides. Therefore, it is recommended that:
1 before bagging agent should choose liquid agent, suspension agent type "stabilize the enemy (pylopyronil)" 4000 times or "love fall (avivine ether)" 4000 times.
2 Immediately after bagging, the agent to be sprayed should be selected from 1500 times the "high-chlorinated methane salt" or 2000 times the "Hunchun" or "4000 times of the "working fly (10% Cyhalothrin)" + "silicone" ( Card products) 2000~3000 times.
When spraying, it is important to pay attention to the spraying of young shoots in the canopy and the outside of the tree to reach the shower. The worms will be eliminated during the emergence period and early invasion period to control and reduce the damage to the fruit tree branches. .
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