Pest control of shellfish insects in mango

This kind of pest, which is distributed in Guangdong, Hainan and Guangxi, is a local sporadic main pest and causes harm only in a few orchards. It can harm the branches, leaves and fruits of the crown, suck the juice of its tissue, cause falling leaves and fruits, and cause premature senescence in serious cases. Insect body fixation causes insect spots in the pericarp and secretes a large amount of honeydew and wax, which causes bituminous coal disease and affects the appearance of the fruit.

There are many species of shell insects harmful to mango, and the main species vary with the producing areas. There are mainly AspidiotusdestrutorSignoret in mango producing areas of Guangdong and Hainan. The female shell is round, 1.8mm in diameter, light brown, thin and transparent. The nymphs first hatched yellowish green, then turned yellow and oval, and the leaves of the whole tree were damaged in spring and summer. Nymphs and adults gathered on the leaves and sucked leaf juice, causing a large number of leaves to lose green and turn yellow, and the newly hatched nymphs crawled to the tender leaves and fruits. After fixed on the back of the leaves or fruit, the insect secreted a large amount of white wax powder, causing soot disease. In recent years, Aulacaspistubercularis (Nemst) has been found in the suburbs of Guangzhou to cause serious damage. In addition, the scale insects reported locally harmful to mango include red wax scale, brown round scale, sagittal scale, long shield scale, mango gum scale and so on.

The control method ① strengthens the orchard pruning technology, improves the orchard ventilation and transmittance, prunes the damaged branches in autumn and burns them centrally. ② was applied in time according to the insect situation, especially when the resistance of the first instar nymph was the weakest, the interval was generally 7-10 days, 2-3 times in succession, and the effective agents were 1000-1500 times spray of 40% fast killing EC and 40% omethoate EC.