(spotted bollworm) –The spotted bollworm is the most important pest of Cotton and Okra. Widely distributed in
tropical and subtropical areas. In India it is more common in Punjab and Rajasthan.
Larva- Brownish with white streaks dorsally and pale yellow ventrally, Without finger shaped processes.
Adult- Small buff coloured. Forewings are pea green with a wedge shaped white band running from base to out margin.
Adult has yellowish fore wings with elongated green streak in the middle. Hind wing is pale whitish. Oviposition takes
place in the night, female deposits 2-3 eggs on leaf bract, flower bud or tender leaf, usually on the under surface.
Fecundity is 200-400 eggs per female. Eggs are deep sky blue or greenish crowned and sculpted on the surface.
Incubation period is 3-5 days. Full grown larva is about 2.0 cm long, brownish with white patches on the dorsal side of the body.
There are 6 larval instars and the total larval development takes 12-18 days. Pupation takes place on the plant or rarely in the
soil among fallen leaves. A boat-shaped greyish silken cocoon is constructed for pupa formation. Pupal period is 7-10 days.
Cotton, bhendi, Abutilon indicum, hibiscus, and several other hosts.
Symptoms of damage on cotton include withered terminal shoots due to tip boring by the larvae during pre-flowering stage;
flaring of bracts during square and young boll formation stage; shedding of squares and young bolls with boreholes; rotten bolls
with larvae and presence on inverted boat shaped cocoon, always outside the fruit on the stem or on the plant debris in the soil.
Young larvae attack growing shoots leading to drooping and withering of the top shoot. In later stages buds,
flowers and bolls are also damaged. Flower buds open up prematurely causing “flared squares”. In damaged bolls pulp is eaten up and lint is stained.
ETL for Earias vitella is 6-8 No’s of moths per trap per day.
Use 8 No’s Pheromone Traps per acre from 15 days crop stage to control pest at early stage.
Trap canopy should be placed one feet above crop canopy to achieve optimum catch.
Recommended trap model :
Phero-Sensor™- BP or Phero-Sensor™ - SP traps.
Recommended for: Cotton, Okra and bhendi.