The red spider can occur many times a year. The adult mainly overwinters at the root of the plant, and parasitizes on the back of the plant leaf when the weather turns warm. From June to July every year, high temperature, little rain and dry weather are the main reasons for the rapid propagation of adults and more insect pests.
In April, check the leaves of the plant in time. If any spider is found on some leaves, remove the leaves in time and clean them up. If there are many spider leaves, you can spray chemicals, you can choose ordinary insecticides, spray evenly, the chemicals have strong killing power, try to dilute.
The body of military mating insect is small, flat and black, which is the most serious pest to Rhododendron. It often stabs and sucks the leaf liquid behind the leaves, causing yellow and white spots on the leaves, causing the leaves to fall off, weak growth of the adult plants, and affecting flowering.
It is found that pests can be sprayed in time, and the effect can be achieved by spraying 1500 times of Omethoate emulsion for 3 to 5 times.
It is mainly harmful to the young branches and leaves of Rhododendron, the light ones can make the leaves lose green, the heavy ones can make the leaves shrink, become hard and brittle, can not absorb nutrients, and affect flowering.
The key point of aphid is prevention. After winter, spray a mixture of sulfur and stone to eliminate the eggs. Spray Omethoate in case of insect damage.
The moth mainly pricks and sucks the juice near the main vein on the back of the leaf, which causes the oil spots on the back of the leaf and causes the leaf to fall off. When the weather is dry in summer, the rainfall increases and then decreases.
In late October and early spring, spray 500 times water solution of the mixture once every three months. (this kind of medicine can be purchased in the flower and bird market, and the specific use method can follow the instructions.)
