How to use Trichogramma cards against borers and caterpillars?

Trichogramma is a tiny wasp that lays its eggs inside the eggs of moth pests, so the pest egg never hatches into a caterpillar. You buy it as small cards, called tricho cards, that carry parasitised eggs about to release the wasps. Timing is everything, you must release them when the moths are laying eggs, which is why pheromone or light traps are useful to tell you when the egg laying flush starts, releasing too early or too late wastes the cards. A common rate is several cards per acre per release, repeated weekly for a few weeks during the egg laying period. Cut the card into small pieces and staple them to the underside of leaves in the shade, away from ants. The big limits are that Trichogramma only attacks eggs not grown caterpillars, and it is destroyed by chemical sprays, so you cannot spray broad insecticides during the release window. Used correctly and early in pests like sugarcane and paddy borers and cotton bollworm it reduces the next generation. It is a supporting tool in a whole IPM plan, not a single solution. Get the right species and release rate from your KVK or a bio control lab.