Post on 25-Feb-2016
description
Identification, symptoms and nature of damage: potato tuber moth and cut worm
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Potato Tuber Moth
The larvae are pinkish-white or greenish in colour with dark brown headThey are about 20 mm in length
The adult moth is very small (about 13 mm) and dark brown in colour
Identification:
Larva Adult
Fig. Larva of potato tuber moth
Source:http://www.fwi.co.uk/assets/getAsset.a spx?ItemID=5225298
Fig. Adult of potato tuber moth
Source:http://4.bp.blogspot.com/0UlluG7ZKE0/TeeOgqQ7NFI/AAAAAAAAAYs/j7XtDbecb0/s1600/1+Potato+tuber+moth+phthorimaea_operculella_male.gif
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Symptoms:In Field: Mined leaves and drooping twigs of the plants are the main symptoms of attack in field
In Store: Tunnelling by larva leads to rotting and foul smelling of tubers due to bacterial infection
Fig. Field infestation of potato plants by potato tuber mothSource: http://www.infonet-biovision.org/default/images/139/crops
Fig. Potato tubers damaged by the potato tuber moth.
Source: http://www.infonet-biovision.org/default/images/139/crops
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Nature of Damage:
Larvae mine the younger leaves and feed on the tubers Larvae penetrate the leaves and feed within leaf veins or stems of the plantLarvae make irregular galleries and tunnel deep inside the tuber in storageThe field infestation is caused either by the moths escaping from godowns or by infested seed tubers
Larval Damage Adult Damage
Fig. Potato field damaged by the larvae Source: www.googleimages.co.in
Fig. Potato tuber damaged by the larvaeSource: www.googleimages.co.in
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Cut worm:
Larvae are dark grey or dull green with smooth and greasy skin . The full-grown larva is 40-50mm in length
The adult is a heavy bodied, greyish-brown or wheat coloured moth and measures 5.0-6.2 cm in length. The adults are strong fliers, found on the hills (in summer) and plains (in winter)
Identification:
1 2 3 4Fig. Different life stages of cutworm 1: Egg 2: Larva 3: Pupa 4: Adults
Source: AINP on White grubs, Department of Entomology, Assam Agricultural University, Jorhat-13
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Symptoms: Cutting down the young potato plants just above or slightly below the surface of the soil
Fig. Cut worm infested potato seedlings
Source: AINP on White grubs, Department of Entomology, Assam Agricultural University, Jorhat-13
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Nature of Damage:Larvae spend the day hiding near the bases of potato plants (5-10 cm of top soil) and at night they come out and cut the young plants just above or slightly below the surface of the soilLarvae are voracious feeders and they cut or fell more plants than they can consumeAfter tuber formation, they nibble and bore into the tubers affecting both tuber yield and market value
Fig. Cut worm infested potato seedlings and tubersSource: AINP on White grubs, Department of Entomology,
Assam Agricultural University, Jorhat-13
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