VECTOBAR TM is a biological larvicide based on a selected strain of naturally-occurring beneficial soil bacteria Bacillus thuringiensis var Israelensis ( VCRC Strain B 17 Serotype 11-14 ) that parasitizes the Mosquito Larvae It is formulated as 4,000 IU/mg Micro Emulsion / Liquid Formulation and used as an effective foliar spray. VECTOBAR TM is a tropicalised formulation that is stable for 24 months at a temperature of 45 Degree Celsius.
Larvicides are more effective and less toxic than adult mosquito sprays and the applications are unlikely to result in adversely affecting human health.
VECTOBAR TM is registered by Indian Pesticides Regulatory Authority - Central Insecticides Board, Govt of India. VECTOBAR TM is approved for use as Bio Larvicide and in Integrated Mosquito Management.
Mode of Action
Protein formation : Bt I is a stomach toxin. It can produce five different microscopic protein pro-toxins that are packaged into a protein container or a crystal. The crystal form of the toxin is referred to as delta-endotoxin. If the endotoxin is ingested, the five proteins are released into the alkaline environment inside the insect's gut. The toxins work alone or together to break down the gut wall. This leads to paralysis and eventually death for the mosquito larva.
Bt I strains have pBtoxis plasmid which encodes numerous Cry and Cyt toxins, including Cry4, Cry10, Cry11, Cyt1 and Cyt2. The crystal aggregation which these toxins form contains at least four major toxic components but the extent to which each Cry and Cyt protein is represented is not known and likely to vary with strain and formulation. Both Cry and Cyt proteins are pore forming toxins which lyse midgut epithelial cells by inserting into the target cell membrane and forming pores
Method of Application
Mix VECTOBAR TM in water and spray on breeding sites. Mix 250 ml of VECTOBAR TM in 10 L of water and spray evenly @ 20 ml / Sq mt.
5 L /Ha gives 80% control in breeding of Culex spp. In casurina pits / drains / disused wells upto 19 days. It is recommended to use 0.50 ml / Sq Meter. Mix 250 ml / 10 L of water and spray evenly @ 20 ml / Sq mt.
10 L /Ha gives 80% control in breeding of Anopheles spp. In breeding pools upto 4 weeks. It is recommended to use 1.00 ml / Sq Meter. Mix 500 ml / 10 L of water and spray evenly @ 20 ml / Sq mt.
10 L /Ha gives 80% control in breeding of Aedes spp. In tree holes cesspits / drains / disused wells upto 19 days. It is recommended to use 1.00 ml / Sq Meter. Mix 500 ml / 10 L of water and spray evenly @ 20 ml / Sq Meter.
Time of application : The application of VECTOBAR TM for larval control is very time-specific. Mosquito larvae go through four life stages called instars. They do not feed between each instar, nor do they feed much during the fourth instar, as they prepare to become pupae. Therefore, it is crucial that the VECTOBAR TM is not applied during these non-feeding periods. Otherwise, the application is wasted and control is not achieved. It is best to treat larval habitats with VECTOBAR TM when the larvae are in their second or third instar. Larval kills can be observed within one hour of ingestion of the VECTOBAR TM. However, higher larval mortality is noted within twenty-four hours of application.
Note : It should not be mixed with strong alkaline chemicals or bactericides. Since it is poisonous to silkworm, it is advised not to use VECTOBAR TM near Sericulture area
Culex quinquefasciatus , Anopheles stephensi
VECTOBAR TM is stable for a period of 24 months from the date of manufacturing.