Pest control of leaf mites in Shenze, a kind of zinzhe grass

Shenze's spider mite belongs to arachnida, mites, Tetranychidae and Tetranychus. It is mainly distributed in the eastern and central regions.

[target] flowers and trees such as zinnia, chrysanthemum, iris, goldfish grass, rose, sweet pea, morning glory, cherry, etc.

[damage characteristics] usually damage the back of the leaves, so that amine damage leaves appear yellow spots, strict birthday, leaves turn brown and fall early.

[morphological characteristics]

The female mites are red, about 0.52 mm long and 0.31 mm wide. Sensillum columnar, dorsal sensillum branchlet-shaped. The end of the valve groove is U-shaped. The dermatoglyphics on the back of the posterior body are rhomboid.

The male mites are about 0.34 mm long and 0.16 mm wide. The end of the penis bends to the back to form an extroverted hammer at the end.

[occurrence regularity] several generations a year, female mites overwintered on the back of deciduous or residual leaves. Female mites usually turn red before overwintering, turn reddish brown the following spring and begin to lay eggs. It has a large reproductive capacity in spring and summer. Under the condition of high temperature drying, the first generation was completed in about 10 days. Generations overlap.

[prevention and control measures] A. Thoroughly remove insect leaves and withered leaves in winter to reduce the number of insects in the overwintering place and the following year. b. At the initial stage of damage, 1000-1500 times of triclofenac EC, 1500-2000 times of 50% diclofenac wettable powder, or 1000 times of imidophos EC were sprayed in time for prevention and control. In winter, you can also choose to spray Baume 3-5 degrees stone sulfur mixture to kill the female mites overwintering on the back of the residual leaves. Pay attention to the back of the leaf when spraying.