Steps involved in lab rearing of Trichogramma chilonis.
Step 1 Rearing of Sitotroga (wheat grains)
Step 2 Rearing condition:
Humidity 60-70%.
Temperature 28-30°C
Step 3 28-30 days of emergence
Shifted for egg laying in the jars
Step 4 Collection of Sitotroga eggs
Step 5 Pasting of 1500 eggs on
paper card 3”×2”
Step 6 Parasitism by
Trichogramma chilonis
Step 7 Collection of parasitized
Sitotroga eggs
Step 8 Trichogramma cards were
stored at a Temperature of 6-8C°.
Distributed: March to September
Step 9 Monitoring based
field releases of T. chilonis for
biocontrol of borer complex
21
Studies on efficacy of Chrysoperla carnea
Chrysoperla carnea commonly known, as Chrysopa is the most effective predator. It is
utilized for the control of borers complex and Pyrilla perpusilla of sugarcane crop. It has the
same host (Sitotroga) as Trichogramma chilonis. Chrysoperla carnea has the peculiarity of
eating eggs, larvae and nymphs of all types of borers, Pyrilla, white fly, bugs and mites. It
can be reared and released in all seasons. Rearing of Chrysopa carnea is more technical,
expensive and time consuming.
Lab. studies conducted at SSRI, has shown that Chrysoperla larvae of 7-8 days life period
has given 80 % predation to the eggs population of Pyrilla. In another study at the lab of the
institute indicated that through release of Chrysoperla larvae, 65 % mortality of nymph of
Pyrilla perpusilla was recorded.
The following steps were involved in lab rearing of Chrysoperla carnea.
Rearing of Sitotroga eggs
Temperature 27-30 oC
Humidity 60-70 %
Freezing of Sitotroga eggs
Filling of 1/3 of capsules by
Sitotroga eggs + 2 eggs of Chrysoperla carnea
Singling of hatched larva
Refilling with Sitotroga eggs
Pupal formation
Opening of capsules
Transfer of Chrysoperla carnea adults
in glass cages
Artificial feeding of Adults
150-200 adults per cage
Egg laying on hard paper sheet
Duration24 hours
Field release
Hatching after 3-4 days)
Attack of the Chrysoperla larvae of third instar on target pest of sugar
cane borers and Pyrilla (all stages)