|Description of adult|
Adult thrips are dark-bodied with a red band on the first three abdominal segments. They are about 3 mm in length and have two pairs of clear wings that have large fringing hairs around the whole margin.
The nymphs are light orange with abdominal segments one and two, and the anal segments bright red.
Eggs are inserted into the tissue on the lower leaf surface and covered with a drop of fluid, which dries to form a black, disc-like cover. Nymphs emerge in about 12 days. One generation is completed in two weeks.
Red-banded thrips are widespread in tropical and subtropical regions of the world.
This pest attacks avocado, cashew, guava, mammey, mango and mangosteen.
Major and sporadic.
Both immature and adult thrips suck sap from cells. The preferred feeding site for thrips is the tissue next to the midrib on the undersurface of leaves, but in severe infestations fruit is also attacked. The first sign of damaging is a silvering of leaves and fruit.
In severe infestations, the silvering develops a pale yellow to brown discolouration, speckled darkly with dried droppings. This insect causes damage to mammey, cashew and mangosteen.
Using a x10 magnification hand lens, check the lower leaf surfaces for thrips especially during warm dry weather. Current knowledge suggests a spray should be applied if a sample of six leaves per tree yields four or more colonies of thrips.
Chemical registrations and permits