Red cotton bug: Dysdercus cingulatus (Pyrrhocoridae: Hemiptera) || KHETI KA HISAB ||

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Red cotton bug: Dysdercus cingulatus (Pyrrhocoridae: Hemiptera) 

Distribution and status: Tropical Africa, Tropical Asia, Australia, the United States, Central and South America, India, and Uttar Pradesh, Bihar, Bombay, and Andhra Pradesh. At crop maturity, a common pest.

Host Plants: Silk cotton, maize, hollyhocks, pearl millet, bhendi, clover, and sorghum. 

Damage symptoms: Both nymphs and adults are responsible for the damage since they discolour the lint and suck up plant and boll sap. As a result, they are also known as cotton boll stains. The bugs tend to gather in large groups. Attacked seeds become less viable. Nematospora gossypii enters the wound site and discolours the fibre.

Bionomics: The adult is an insect with ventral white stripes on its abdomen that is red and black. In the earth, the eggs are placed in irregular heaps. The bug has a fecundity between 100 and 130. 4- to 7-day egg period. Six instars are required for the nymph to reach adulthood. Nymphal period duration ranges from 26 to 89 days. During the winter, the adult bug enters into hibernation, a period of relaxation. 

Management: 

Ø Harpactor costalis, a biocontrol agent, preys on both nymphs and adults

Ø The infected leaves or bolls can be dipped in water and shook to drown the insect because it feeds gregariously.

Ø To reveal the eggs, plough the field.

Ø Spray either 35 EC 750 ml/ha of orendosulfan or fluvalinate 25 EC 200-400 ml/ha. 

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