Dogor Crocidolomia pavonana — Wikipedia The male can be distinguished by the tufts of dark-coloured hairs at the front of the forewings. Look for the egg masses on the lower surfaces of the leaves, along the midrib and main veins. The adult moth is light brown, just less than 20 mm long, with two small white triangular spots on each forewing Photo 2. Several parasitoids are known to attack the larvae of this moth in different parts of its range.

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Large cabbage-heart caterpillar, cabbage cluster caterpillar, large cabbage moth caterpillar Scientific Name Crocidolomia pavonana; previously, known as Crocidolomia binotalis. Distribution Widespread; Asia, Africa, Oceania.

In each of these countries, the species is given as binotalis, an older name. Hosts Members of the brassica family - broccoli, cabbage, cauliflower, Chinese cabbage, mustard and radish. Eggs are laid on the underside of the outer leaves in batches of 10 to more than a They are pale green at first, becoming bright yellow, and then brown before hatching.

The caterpillars grow to 20 mm, with long hairs and white or pale green stripes Photo 1 ; the later stages make thick webs over the leaves, and the caterpillars feed beneath them. Often, they feed at the plant centre. The caterpillars pupate in the soil. The adult moth is light brown, just less than 20 mm long, with two small white triangular spots on each forewing Photo 2.

The life cycle is about 22 days in the lowlands, and 35 days in the highlands. The caterpillars often occur with those of diamond back moth. Even a single caterpillar is capable of causing significant damage and, therefore, economic loss. Look for caterpillars at the centre of cabbages with white or pale green stripes; look for the presence of webbing and faeces small brown droppings.

Generalist predators, e. In Samoa, a strain of Trichogramma chilonis has been found that lays its eggs in the eggs of Crocidolomia. Mustard is a preferred host for this insect pest and protects the cabbages from destruction.

Plant the first row of mustard about 15 days before transplanting the cabbages, and the second row about 25 days after transplanting. Plant far from old plots of brassicas to prevent infestation from previous plots.

During growth: Handpick caterpillars from plants in the field when numbers of insects are low. Grow plants under nets or in screen houses, if resources allow. After harvest: Collect and destroy crop debris after harvest. Eggs are not susceptible to Bt. Small larvae are more susceptible to Bt than fully grown ones. Use Bt as soon as damage is seen. Avoid using broad-spectrum insecticides such as pyrethroids and organophosphates as they will kill natural enemies.





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