(Diamond Back moth) –sometimes called the cabbage moth,
is a moth species of the family Plutellidae and genus Plutella.It is a most destructive cosmopolitan pest,
damaging severely cruciferous crops and distributed widely in South-East Asia. The small, grayish-brown moth
sometimes has a cream-colored band that forms a diamond along its back. It's believed that the species may
have originated in Europe, South Africa, or the Mediterranean region, but it has now spread worldwide.
The moth has a short life cycle (14 days at 25 °C), is highly fecund, and is capable of migrating long distances.
Diamondback moths are considered pests as they feed on the leaves of cruciferous crops and plants that produce
glucosinolates. However, not all of these plants are equally useful as hosts to the moth.
Identification of pest :
Egg: Minute yellow coloured eggs laid singly or in groups on the upper surface of leaves.
Larva: Pale yellowish green caterpillar.
Pupa: Pupation takes place on the foliage in a transparent cocoon.
Adult: Small greyish brown moth. Forewings have three white triangular spots along the inner-margin.
Adult folds the wings that appear with triangular markings, opposite wing with diamond shape.
Host plants :
Cultivated crops that include Broccoli, Cabbage, Cauliflower, Weed hosts such as mustard and radish.
The first instar sometimes feeds in the spongy plant tissue beneath the leaf surface forming
shallow mines that appear as numerous white marks. These mines are usually not longer than the
length of the body. The larvae are surface feeders in all subsequent stages. These larvae feed on
the lower leaf surface 62-78% of the time, chewing irregular patches in the leaves. All the leaf
tissues are consumed except the veins. On some leaves, the larvae feed on all
but the upper epidermis creating a "windowing" effect. The last stage larva is a voracious feeder;
it causes more injury than the first three larval instars.
ETL for Plutella xylostella is 6-8 No’s of moths per trap per day.
Use 8-10 No’s Pheromone Traps per acre from one month crop stage to control pest at early stage.
Trap canopy should be placed one feet above crop canopy to achieve optimum catch.
Recommended trap model :
Stick-O-Magic™ Water trap
Recommended for: Broccoli, Cabbage, Cauliflower, Mustard and Radish.