Egg Parasitoids - Tricho cardsTrichogramma spp.

Trichogramma chilonis and Trichogramma japonicum are recommended for control of sugarcane early shoot, internode and top borers, rice stem borer and leaf folder, cotton bollworms, tomato fruit borer, groundnut leaf defoliator, etc.

Advantages:

  • Being egg parasitoid, Trichogramma destroys the pest before it emerges as larva from the egg.
  • By preventing the pest at early larval stage from feeding on the crop they help to avoid the cosmetic damage on the crop.
  • Eco-friendly, as they do not affect any beneficial organisms in and around the farm.
  • Cost effective and easy to handle for field release.
  • Can be used at any stage of the crop period. It is a useful alternative when chemical control is not adoptable, due to crop canopy being not accessible to sprays.

Precautions:

  • Strips of tricho-cards should be stapled on the inner side of the leaf, to avoid direct exposure of egg surface to rain and sunlight.
  • Refrain from using chemical pesticides in the field where Trichogramma are released. If such need arises, use selective/ safer (Trichogramma compatible) pesticides, 7-10 days before or 5 days after release of parasitoids.

Method of release of Trichogamma Parasitoids:

Trichogramma adults are sensitive to rain and high temperature. Ants and spider canalso prey upon the parasitized eggs before the adult emergence. For protecting the adults, the Trich-cards strips (blue cards- T. chilonis;Yellow cards T.japonicum) should be tied or stapled inside a disposable cup and their mouth closed with a mosquito net or gauze secured by a rubber band. The cups are to be tied on plants or stake in an inverted position so as to protect from rainwater and also from sun and predators. The cups are to be tied at crop height suing sticks at the different release location in a crop. Where cups are not available, the Tricho cards can be directly tied to the stake/ plant.

Crop and Pest Trichogramma Species Dosage/ Time interval
SUGARCANE    

Early shoot borer (Chilo infuscatellus)

T. chilonis

1cc/acre, at 7-10 days interval from 30-35 days after germination (4 th to 14 th week)

Internode borer (Chilo sachariphagus indicus)

T. chilonis

1-2cc/acre, at 7-10 days interval from 90 days after germination (15 th to 40 th week)

Top shoot borer (Scirpophaga excerptalis)

T.japonicum

1-2cc/acre at 7-10 days interval from early incidence onwards (12 th to 30 th week)

COTTON    

Old world bollworm  (Helicoverpa armegera)

T. chilonis

2-5cc/acre, at 7-10 days intervals from flowering onwards

Pink bollworm   (Pectinophora gossypiella)

T. chilonis

2-5cc/acre, at 7-10 days intervals from flowering onwards

Spotted/ Spiny bollworms  (Earias spp)

T. chilonis

2-5cc/acre, at 7-10 days intervals from flowering onwards

RICE    

Paddy stem borer (Scirpophaga incertulas)

T. japonicum

2-4cc/acre, at 7-10 days interval from 15-20 days after transplanting

Leaf folder Cnaphalocrocis medinalis)

T. chilonis

2-4cc/acre, at 7-10 days interval from 15-20 days after transplanting

PULSES/OILSEEDS    

Pod borer (Helicoverpa armegera)

T. chilonis

1-2cc/acre, at 7-10 days intervals from flowering onwards

VEGETABLES    

Tomato fruit borer (Helicoverpa armegera)

T. chilonis

4-8cc/acre, at weekly intervals from the flowering onwards

Brinjal fruit & shoot borer (Leucinodes orbonalis)

T. chilonis

4-8cc/acre, at weekly intervals from the flowering onwards

Colony forming units (CFU) for talk based
2x10^8 and For liquid formulations 2x10^9