Varsha - Bioscience and Technology







VBT is a bio-insecticide having spores and crystal proteins of bacteria called Bacillus thuringiensis var Kurstaki. It is an environmental friendly organic bio-insecticide formulation with little or no effect on humans, wildlife, pollinators, and other beneficial insects.

Target Insect Pests

VBT is recommended against Caterpillars like bollworms, Helicoverpa armigera, paddy leaf folder, leaf eating caterpillar like Spodatra litura, Webbers like muruka, the cabbage pests like diamond back moth, Plutella xylostella, coffee berry borer, pod fly, several coleopteran larval pests. Bacillus thuringiensis is reported active against more than leapidopterous species in their larval stage.


VBT kills up to 4th instars larvae. It will not kill larvae that are about to become pupae. The best efficacy is obtained when VBT is applied at the time of hatching and/or first to 3rd larval instars. Since VBT must be eaten by the insect along with its food, a thorough spray covering the entire parts of the plant is recommended.

Mode of Action

VBT is a stomach poison. Larvae feeding on the VBT sprayed plants stop feeding within 2 hrs after the injection of the lethal dose. The death usually occurs 3-5 days during which no further feeding occurs.

Crop Safety and Residual Efficacy

The residual effectiveness of VBT is reported for 6-10 days based on the environmental conditions. Re-application depends mainly on the plant growth and pest population.

Table 1. Efficacy of VBT 0.5%WP under All India Co-ordinated study on pigeon pea crop



% pod borer damage

Seed yield (Kg/ha)

1 VBT- 1kg/ha 22.16 868.15
2 VBT-1.5kg/ha 18.51 911.11
3 Halt-1.0 Kg/ha 24.00 857.78
4 Halt-1.5 Kg/ha 20.25 909.63
5 Dipel-1.0 Kg/ha 25.59 848.89
6 Dipel-1.5 Kg/ha 19.86 905.93
7 Endosulfan 35 EC 0.07% 19.75 925.93

Safety data

No adverse effect on beneficial arthropods, predators, parasites and mammals has been observed up to now in all laboratory and field experiments.


The dose /acre are given below for different crops-


Recommended Pest


Paddy Leaf folder & stem borer 500g/acre
Vegetables, Pigeon Pea, Chick Pea, Chilli, groundnut, cotton Helicoverpa armigera, Spodoptera litura, Larval leaf folder 500g/acre
Cotton (Achaea janta) Castor semi looper 100-150g/acre
Cabbage and Cauliflower Diamond back moth 350-500g/acre
Other crops Lepidopterous Larval Pests Based on the crop age, insect and pest density varies from 200-800g/acre

Recommended Spray Fluid

About 100-400 litres of water as per the crop and its age.