Thorax - 10-11 segments. Spiracles on segments 1 to 8. Prolegs on segments 3-6 and 10.
Habits - Herbivorous. Curls up when disturbed.
Pupa - In soil, in a silken cocoon.
Moth flies by night and lays eggs on plants. Caterpillars remain close to where eggs were laid. Small caterpillars eats soft plant tissue, larger one burrow into the plant leaving a hole about 3mm wide. Pupa lives in soil beneath the plant. In Victoria there are 3 generations in a year.
Origin and History:
Some species are cosmopolitan and others native to Australia. Caterpillar is a pest of a wide variety of crops and plants including mallows. Eats buds, flowers, fruits and young leaves usually making a characteristic round hole. Caterpillars are often seen with their heads buried in this hole. Budworms (Helicoverpa punctigera and H. armigera) are major pests of cotton, sunflower, lupins, linseed, tomatoes, beans, peas, lucerne, maize and tobacco.
Some of these species may migrate over considerable distances. This may carry insecticide tolerant strains into susceptible populations or dilute tolerant populations with susceptible strains.
Orius flower bugs eat the eggs of Budworms.
Management and Control:
A number of strains have become tolerant of common insecticides, which can make control very difficult.
In Faba Beans they are hard to find and 2 grubs in 20 sweeps (taken at the beginning of podding) is usually worth controlling. Spray at the commencement of podding. A single spray at this time is usually sufficient.
Higher numbers, earlier in the season, appear to have little effect on the yield of Faba Beans or Chickpeas, if seasonal conditions result in low numbers at podding.