Sugar orange bran flakes born infestation hazard symptoms life habit control method
Bran flake borer, also known as gray spotted oyster, occurs in sugar orange producing areas.
【Hazard symptoms】Bran flap beetle mainly harms sugar orange branches, leaves and fruits, and the damaged part of the leaf shows light green spots, and the injured part of the fruit shows yellow-green spots, affecting the quality and appearance of the fruit. Bran flap fungus induces soot disease, which covers the tree body with a layer of black mold, affects photosynthesis, thereby weakening the tree potential, and even causing the branches and leaves to die.
【Morphological characteristics】 (1) Adult female adult shell 1.5-2mm long, mostly irregular oval or oval, gray-brown or off-white, like bran flakes. Female adults are nearly round, light purple or purple-red. Male adult shells are about Imm long, light purple, and male shells are slender and off-white. Yoshiyama Huayao
(2) Oval, light purple.
(3) Nymphs are flattened, oval and light purple when they hatch, and the feet and antennae disappear.
【Living Habits】Bran flakes occur in 3-4 generations in Gannan, Jiangxi Province, overwintering with female adults and eggs, and there are also a few 2-year-old nymphs and pupae overwintering. Generations overlap in the field, with generations of 1-2 year nymphs occurring in April-June, July-August, August-October, and November to April, but the nymphs are the most infested in August-October. Female adults can reproduce parthenogenetically and lay eggs for up to 3 months. After hatching, the nymphs feed under the mother or crawl out of the mesohus for fixed feeding, and secrete white wax to form a white cotton-like powder to cover the worm body. The first generation of nymphs mainly feed on leaves, and the second and third generations of nymphs mainly harm fruits. Bran flap flyflies live on shaded or poorly lit branches and leaves, especially where there are cobwebs or dust covering the most, first endangering the branches of the plant, and then spreading to the fruits and leaves. There are many foliar insects, and there are many depressions on the fruit.
【Prevention and control method】
(1) Pharmaceutical control Seize the 1st and 2nd instar nymphs to spray during the peak period, spray once every 15-20 days, and spray 2 times in total. The medicinal agent is selected with the same arrow-tipworm.
(2) The use of natural enemies to control Japanese square head beetles, grasshoppers, long-tasseled aphid wasps and golden aphid wasps, etc., are all natural enemies of bran aphids, and attention should be paid to protection and utilization.
(3) Agricultural control measures Strengthen cultivation management, increase the application of organic fertilizer, improve soil structure, enhance tree potential, and improve the insect resistance of plants. In winter, the garden is completely cleared, and the severely damaged insect branches, dry branches and closed branches are removed, and the ventilation and light transmission conditions are improved to reduce the source of insects.