The VL Whitegrub beetle trap which is designed and developed by ICAR-VPKAS, Almora has been granted a patent. As we all know that insects are attracted to light, the trap is designed specifically based on the behaviour of the whitegrub/ scarab beetles, so as to trap the scarab beetles excluding the other insects, which also get attracted to the light. Scarab beetles hover around the light source in circular fashion and thus, three hitting fins are arranged to have maximum success in hit and capture. The uniqueness of the trap lies on the space given between the light source and the hitting fins and the gap between the funnel stem and the collection pot. The space between the light source and the hitting fins allow the beneficial insects being weak fliers and attracted towards light to pass on and not getting hit and trapped. The gap between the stem of the funnel and collection pot allows some other insects to escape. The trap is found to capture 68% of scarab beetles, 32% others (mostly of Isoptera and Lepidoptera) and a negligible amount of beneficial insects to a tune of <0.8%, which shows it as a whitegrub specific trap. The trap is made of 24 guage tin sheets and the hitting fin itself will act as a light reflector at night.
A trap normally capture around 10,200 beetles per season (June to October) in the first year of installation at a site and around 5,000 beetles in the second year at the same place which reduce to 800 in the fifth to sixth year. The VL whitegrub beetle trap is well popularized in Uttarakhand through the efforts of the institute and state department of Agriculture through trainings and demonstrations.