Symptoms and control of insect pests in Myrica rubra

The main pests harmful to bayberry trees are pine caterpillar, debt avoidance insect and leaf curl moth, which generally hatch larvae in April or May. The growth characteristics and control methods of pine caterpillar pine caterpillar are briefly introduced as follows: 1. Pine caterpillar harms many kinds of forest trees. Its newly hatched larvae cluster new shoots to eat tender leaves, and disperse the food damage one week later, leaving only leaf veins in serious cases. Dendrolimus punctatus produces one generation a year, hatches larvae in early April, and cocoons into pupae on leaves in the first and middle of May. Control methods: ① newly hatched larvae should be killed in time, or sprayed with 90% trichlorfon 1000 / 1300 times or 80% dichlorvos 1000 / 1300 times; ② adults have strong phototaxis and can also be trapped and killed by light. 2. Debt-avoiding insects mainly harm the new shoots and leaves of Myrica rubra. Once a year, the mature larvae overwintered in the protective capsule, pupated in April of the following year, emerged as adults in the first ten days of May, and the female laid eggs in the protective capsule in the first ten days of May. The larvae were hatched in the last ten days of May, and the spitting leaves were attached together to make a new protective capsule and began to eat. Control method: spray trichlorfon or dichlorvos at larval stage. 3. The leaf roll moth larva harms the leaves of red bayberry, spinning silk and wrapping leaves on the tender leaves of the new shoots, and the larvae feed on the harmful mesophyll and pupate cocoons. Prevention and control methods: when it is found that the harm can be sprayed 1000 times of fenitrothion or 4000 times of pyrethrin.