Cotton aphid: Aphis gossypii (Aphididae: Hemiptera) || KHETI KA HISAB ||

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Cotton aphid: Aphis gossypii (Aphididae: Hemiptera)

Distribution and status: India, sometimes serious.

Host plants: Cotton, bhendi, brinjal, chillies, guava 

Damage symptoms: It could be a problem on cotton, infesting the underside of the leaves and vulnerable shoots. They are numerous, sucking the sap and causing stunted growth before gradually drying up and killing the plants. The plant takes on a dark appearance as a result of the growth of black sooty mould brought on by the excretion of honey dew.

ETL: 5% of infested plants.

Bionomics: The aphids are tiny, soft-bodied, greenish-brown insects. Both apterous and alate females reproduce viviparously and parthenogenetically. A single female can give birth to 8–22 nymphs a day, and they mature into adults in around 7-9 days. Ants frequently visit them because of the pleasant honey dew excretion. In congested areas, winged figures could be visible.

Management

       I.            From the fourteenth day after sowing, keep an eye on the nymphs and adults of early season sucking pests.

    II.            Maintain Monochilus sexmaculatus, Coccinella septumpunctata, Aphelinus mali, A. flavipes, and Phylloscopus tristis as natural enemies.

 III.            Use 500 L of water per hectare to squirt any of the following pesticides. 

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