Potato Tuber Moth (Phthorimaea operculella)

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Presentation transcript:

Potato Tuber Moth (Phthorimaea operculella)

POTATO TUBER MOTH Order: Lepidoptera Family: Gelechiidae Distribution: Cosmopolitan-tropical and subtropical Host: Potato, tomato, eggplant, tamarillo leaves (tree tomato)

DESCRIPTION Narrow silver-grey body with Greyish brown wings marked by small, dark specks Body length: 10 mm Wings are fringed

DAMAGE Leaves and tubers

Damage symptoms on leaves

Damage symptoms on tubers

Life-cycle Eggs: laid singly on underside of leaves and exposed tubers Eggs are small, spherical, translucent, and range in color from white or yellowish to light brown.

Life-cycle Larva: Larva 1-2 mm long and grows through 4 instars to reach 15-20 mm long. All larvae have dark brown head. Larva first mine into leaves and later into stem. Larval period lasts 2-3 weeks in summer. Larvae also excavate tunnels in the tubers

Life-cycle Pupa: Pupa are formed in a silken cocoon covered with soil particles and debris for camouflage. Pupation occurs on dead leaves or on stored potatoes. Moth appears in 7-10 days Life-cycle is completed in about one month. As many as 5-6 generations occur in a year. The moth mainly hibernates in the form of pupae and emerges with the onset of warm dry conditions.

Management Use clean seed Destroy tuber moth infested tubers, plant debris and volunteer plants Do not expose the tubers (earthing up) Sort out the tubers before storage.