To prevent shoot malformation at bud sprouting to initial shoot growth stages, foliar spray of imidacloprid 17.8 SL @ 0.4 ml per litre water. During later stages, removal of loose bark and plant wash with buprofezin 25 SC @ 1.25 ml per litre water (PHI 65 days). For vineyards nearing harvest, bunch wash with silicone-based surfactants @ 0.3 ml per litre water followed by water wash. Avoid using broad spectrum insecticides during rainy season for stem wash, instead remove loose bark and stem wash with Metarhizium anisopliae @ 1.5 litre per acre at monthly interval as preventive measure. Foliar spray of imidacloprid 17.8 SL @ 0.4 ml per litre water may be given to manage mealybug on canes during rainy season.
Preventive application of imidacloprid 17.8 SL @ 160 ml per acre during bud sprouting stage and subsequently lambda cyhalothrin 4.9 CS @ 200 ml/acre (PHI 45 days) or fipronil 80 WG @ 25 g/acre (PHI 75 days; only one application before flowering stage) or spinosad 45 SC @ 100 ml/acre (PHI 15 days) or spinetoram 11.7 SC @ 120 ml/acre (PHI 30 days) as per need.
Need based foliar spray of cyantraniliprole 10 OD @ 280 ml/acre (PHI 60 days) or emamectin benzoate 05 SG @ 88 g/acre (PHI 30 days) or fipronil 80 WG @ 25 g/acre (PHI 75 days; only one application before flowering stage) or spinosad 45 SC @ 100 ml/acre (PHI 15 days) or spinetoram 11.7 SC @ 120 ml/acre (PHI 30 days).
Three types of stem borers cause damage in grapes, namely, Celosterna scabrator, Dervishiya cadambae and Stromatium barbatum.
Regular monitoring at 7-10 days interval and manual removal of grubs of Celosterna scabrator during December to April months at the initiation of symptoms of removal of frass
Removal of loose bark during July to September months when the young Dervishiya cadambae larvae are feeding under loose bark before boring inside main trunk and cordons.
Removal of loose bark at beginning of rainy season to reduce shelter and creating smell of neem leaves inside the vineyards to repel the adult beetles away.
Installation of light traps outside the vineyards during high humidity months and need based foliar spray of cyantraniliprole 10 OD @ 280 ml/acre (PHI 60 days) or emamectin benzoate 05 SG @ 88 g/acre (PHI 30 days) or fipronil 80 WG @ 25 g/acre (PHI 75 days; only one application before flowering stage).
Installation of light traps outside the vineyards during September to December months and need based foliar spray of imidacloprid 17.8 SL @ 160 ml/acre (PHI 70 days; Use of imidacloprid should be avoided during pre-flowering and flowering stage)) or lambda cyhalothrin 4.9 CS @ 200 ml/acre (PHI 45 days) or fipronil 80 WG @ 25 g/acre (PHI 75 days; only one application before flowering stage) during late evening to night.
Hand collection and destruction of beetles is the best strategy to manage it. The beetle generally becomes active at night around 9 pm and prefers to stay on the plant which it did cut previous night or the nearby plants. These plants may be observed at night with the help of torch and beetles can be hand collected and killed. Spraying of insecticides doesn’t seem economically viable option as the number of damaged plants are generally 1-2% only. Where the plant stem has been completely cut, raise new shoot below this portion.