How to control black helmet scale beetle of flowers

The black helmet scale beetle is also called the coffee black helmet beetle. There are many host plants, and flowers are mainly harmful to cycad, duck toe grass, ivory red, variable leaf wood, tortoise back bamboo, hanging orchid, camellia, citrus, palm, orange, grapefruit and so on.

Adults and nymphs suck host sap on flower leaves and branches, light leaves turn yellow, heavy leaves dry and fall off, and the honeydew secreted by them is easy to cause coal fouling disease.

There are three generations in a year. The first generation of newly hatched nymphs occurred in late May, the second generation occurred in August, and the third generation occurred in early November. The female adult lays eggs under the helmet-shaped scale shell, each female lays about 300 eggs, often parthenogenetic, and the female adult dies after laying eggs.

Prevention and control methods:

(1) cut off the leaves and branches manually, or scrape the insect bodies on the leaves and branches, and be careful not to touch the shoots and buds.

(2) spraying 2.5% permethrin and other pyrethroid pesticides 2000-3000 times during the nymph incubation period.