Economic Threshold Level (ETL)

It is the pest density at which control measures should de applied to prevent an increasing pest population  from reaching the economic injury level    

Name of the Insect Pests	Economic threshold level
Bollworms complex	5% incidence level in shed fruiting bodies.
American bollworm	One egg or larvae per plant.
assids	2 jassids/leaf.
Whitefly	8-10 adults or 20 nymphs per leaf during early morning.
Aphids	10-29% affected plants.
Thrips	10 thrips per leaf or 15-20% affected plants.
Nematode	1-2 larvae per g of soil.
Rodents	15 live burrows per ha.
Stem weevil	10% damage plants.