Trichogramma Sp. platneri for Caterpillar Control


T. platneri are native of western U.S. and recommended for western trees, avocados, ornamentals, orchards, and grapes. For western apple, pear, walnut growers as well as other Lepidoteran pests in the orchard. 

LIFECYCLE: As the parasite develops within the egg, it turns black, and after about 10 days, an adult Trichogramma emerges. Adult Trichogramma can live up to 14 days after emergence. 

RELEASE INSTRUCTIONS: Trichogramma cannot be stored. Release monthly for 1-2 months. Keep the cards in a warm, humid place out of direct sunlight until the emerging adults can be seen as small dots moving around in the closed container. 

A few tiny caterpillars may also be found in the container because it is very difficult to obtain 100% parasitization of the moth eggs, but these are harmless in most crops. Trichogramma are shipped as pupae ready to emerge as adults, usually glued to perforated cards. Each card can then be broken into thirty 1-inch squares to permit even distribution in fields and orchards. Loose eggs are also available on request for aerial release in addition to cards. Parasitism rate can be monitored by comparing the ratio of black (contains pupating Trichogramma) to white (unparasitized) eggs. Parasitism can range from 70% to 95%. The sex ratio may range between 50% and 75% female. A more uniform measure of yield is the number of females. 

Cut the Trichogramma Card into 30 hangable tabs, and hang tabs on or near the plants to be protected. Each unit or tab has a built-in hook that fits over a 1/4 inch stem. Card stock is black to optimize emergence. When most of the adults have emerged, place the cards in a shaded spot upwind of the areas where moths are suspected or egg laying is occurring. Do not put the cards out before the wasps have emerged because ants and other predators may eat them. The emerging wasps will have the best chance of finding and parasitizing eggs when the weather is moderate. Good timing and higher frequency during moth flight are more important factors than wasp numbers. Use generally 1/4 card to 2 cards per acre weekly during moth flights, increasing with moth trap counts. 

RELEASE RATES: Note - These rates are for preventative control only, multiple releases and/or higher quantities are necessary for heavier infestations.


10,000 Insects 500 sq. ft.
100,000 Insects 1 Acre