Leaf beetles belong to the Coleoptera family Officinalis Insects of this family are closely related to host plants, adults and larvae are plant-feeding, and many species are the main pests of agriculture, forestry and Chinese medicinal materials. This article mainly introduces the prevention and control measures of the red leaf plum leaf beetle, hoping to bring help to everyone.
[1] Morphological characteristics
Generally 1 to 17 mm in length, oblong, diverse in color, exposed head, mostly sub-anterior; protruding compound eyes; antennae 11 segments, mostly filamentous; upper lip base is obvious; the dorsal plate of the anterior thorax is more transverse; elytra generally covers the abdomen; 7 segments are visible on the back of the abdomen; the foot is long, the tarsal segment is pseudo-4 segments, and the 4th segment is small and hidden at the base of the 5th segment. The leaf carapace belongs to the family Phylloscopidae of the coleoptera family and is a large group of coleoptera insects.
[2] Hazard characteristics
Adults and larvae feed on leaves that are missing or hole-like, and in severe cases, they are reticulated, leaving only leaf veins, resulting in reduced yield.
[3] Occurrence law
Jiangxi, Fujian, Zhejiang and Sichuan have one generation per year, with larvae overwintering at 15-25 cm under the soil, some in Sichuan and Fujian overwintering in sweet potatoes, and some feathered adults in Zhejiang overwinter in stone crevices and dead branches and leaves. In Zhejiang in late May of the following year, the larvae began to pupate, entered the peak period in mid-June, the adult insects were seriously infested in late June, and the eggs were laid in the early and middle of July, and the adults first lived in the soil chamber for a few days after feathering, and then unearthed as a pest, especially after 2-3 days after the rain, the most harmful at 10 o'clock and 16-18 o'clock, and hidden under the soil cracks or branches and leaves at noon. Adults have poor flight power and strong hunger tolerance, and adult worms live 34 days for females, about 54 days for males, 21 days for spawning, and 9 days for eggs. The larval stage is about 10 months and the pupal stage is about 15 days. The relative humidity is less than 50%, the larvae stop moving, the soil temperature is lower than 20 ° C, and the larvae burrow into the deep soil layer to create a chamber for overwintering.
[4] Prevention and control measures
1. The use of adult insects has suspended death, early and late when roosting on the leaves, it will be shaken down and concentrated to eliminate.
2. Protect and utilize predators.
3. Clean the garden in time to prevent adult worms from laying eggs.
4. Pharmaceutical prevention and control: It is recommended to use Guangzheng when the disease occurs, and choose a windless sunny day to dilute the agent for spray prevention and control.
