Shot hole borer Xyleborus sp. (Scolytidae: Coleoptera)
This is becoming a major pest nowadays on pomegranate in Karnataka. Early diagnosis with symptoms is a must. Hence, regular visit to orchards by growers is suggested. Signs of lateral branch yellowing to quick drying of full tree, should be immediately brought to notice of specialists and treatments should be undertaken as follows:
· Drench soil around main trunk with a mixture of chlorpyriphos 2.5 ml with altering recommended fungicides (carbendazim 1g/litre or propiconazole 2ml/litre) at monthly intervals.
If pest is severe, repeat the above drenching after a month.
If infestation is low, drench with Azadirachtin (0.15%) 3ml/litre around main trunk 2-3 litres of mixture/tree with either of the above fungicides.
Avoid water logging and keep soil raked and aerated.
Infested trees should be uprooted and burnt, especially the root zone.
Pits of uprooted trees should be treated with chlorpyrifos 2.5 ml/litre, by thoroughly drenching.
Drench soil with chlorpyriphos 2.5ml/litre around all un-infested tress prophylactically once in six months, followed by a spray on trees with Quinalphos 2.5ml/litre, followed by Azadirachtin 1500 ppm 3 ml/litre. Avoid leaving infested trees in field after uprooting.
In case of nematode occurrence, need based application of either phorate 25g/ plant or carbofuran 40g/plant to the basins have to be supplemented to bring down nematode population.