Prevention and treatment measures: Deeply turn the soil in winter, clean the weeds, and minimize the survival rate of pests and diseases. When the green belt or flower diameter density is too large, some seedlings should be properly removed to optimize the ventilation effect. May is the multi-period of the pest every year. At this time, spray with 20% fenvalerate 1500 times. Pay special attention when spraying, and spray the grass on the back and sides of the leaves every 7~10 days. Spray once for 3 times.
2, the main hazards and symptoms of the genus Spodoptera: the spotted worm, also one of the common pests that harm the rhododendron buds, the larvae of this kind of pests eat the flower buds and young shoots, and the young shoots will die when they are serious. The flower buds fall into the air and affect the growth and appearance of the cuckoo.
Prevention and treatment measures: When the hazard is not serious, only the damaged flower buds and young shoots should be removed and burned intensively. When the damage is serious, spray with 45% of the speed-disinfecting insect 1000 times.
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