Grape Root Borer : The Most Destructive Insect
Grape is an important commercial fruit crop of south India. Grape growing has been regarded as most remunerative enterprise. India is among the first ten countries in the world in the production of grape. This crop occupies fifth position amongst fruit crops in India with a production of 1.21 million tonnes (around 2% of world’s production of 57.40 million tonnes) from an area of 0.05 million ha. in 2001-02. The area under grape is 1.2 % of the total area of fruit crops in the country. Production is 2.8% of total fruits produced in the country. About 80% of the production comes from Maharashtra followed by Karnataka and Tamil Nadu. As is true of many fruits, a long list of insects causes problems for grapevines. Insects that can affect grapes include the grape phylloxera, grape flea beetle, grape berry moth. Insects feed on buds, leaves, and fruit. The most damaging are those that feed on fruit because resulting rot can spread throughout the entire cluster .
Grape root borer is potentially the most destructive insect attacking grapes in India. Larvae of this insect tunnel into the larger roots and crown of vines below the soil surface. Borer damage results in reduced vine growth, smaller leaves, reduced berry size, and fewer bunches of grapes. Because damage is restricted to below ground, problems often go unnoticed until vine decline is observed. Damage caused by larval feeding can range from just a few feeding sites to complete root system destruction. Adults are brown moths with thin yellow bands on the abdomen and resemble some paper wasps. The front wings are brown while hind wings are clear. Male moths fly about in a manner similar to wasps. Larvae are cylindrical, cream-colored, with three pairs of true legs near the head and five pairs of fleshy abdominal pro legs each bearing two bands of tiny hooks. The larvae are 1-1/2 inch long when mature and have a retractable brown head.
Adults emerge from the soil in mid summer. Eggs are laid on the soil surface, grape leaves, and weeds with eight days of adult emergence. Females lay an average of 350 eggs. Eggs hatch in about two weeks and larvae immediately tunnel into the soil in search of grape roots. About 95% of the larvae die before reaching roots, but less than 1% die after finding grape roots. Larvae will feed on the roots for 2 years. During the summer of the second year, larvae will pupate near the soil surface.
HPM’s prime mission is to protect agriculture. We believe that each farmers use our products with trust and confidence. Our Apollo is an insecticide and acaricide with contact and stomach action. It is the best solution for grape producers. It provides the complete protection from grape root borer. It inhibits moulting of nymphs and larvae, leading to death. The products also suppresses ovipositor by adults and treated insects lay sterile eggs. It is not phytotoxic when used as per recommendation.