Leaves and flowers of infected plants are deformed and dry. Impaired adult insects and larvae. The body of an adult thrips 1-1,5 mm, narrow, elongated, flat. Trips black or brown with yellow, reddish belly. Two pairs of wings. In the larvae of the yellow body. Females lay a sheet of pulp is light transparent eggs. Development from egg to adult insect is 20-30 days. The photo shows the flower of Saintpaulia damaged by thrips, thrips themselves are very small, like little black dots on the leaves.
Main factor contributing to the reproduction of thrips, a high temperature and low humidity. In the indoor environment thrips can harm all year round, but especially in spring and summer. If you look to the naked eye, it looks like thrips black dot. In the worksheet, yucca, damage caused by thrips in the transmission visible light points. Damaged mainly the leaves. On the underside of the leaf thrips lays numerous colonies on the upper side of the sheet appear bright spots.
As a result, the upper side of the leaf is gray-brown with a silvery sheen. When mass destruction all the leaf surface becomes whitish and discolored, then the leaves turn brown and fall off. Thrips cause damage to the main flowers that are borne spotted and deformed. In addition, thrips plant pollutes their sticky black discharge, which settles a carbon black fungus. Control measures. Plant should be sprayed, if necessary, repeatedly insecticides (fitoverm, decis, aktellik, Inta-vir)