23 Kas 2024 Cumartesi
A preliminary study on mite damage assessment in mulberry
Abstract :Jammu and Kashmir is the only state in India which enjoys the salubrious climate for bivoltine silk production and is the fourth major state in India. Lot of efforts are being pumped in to introduce a second crop in the state to explore the hidden potential available. Incidence of diseases and insect pests are the major bottlenecks in producing quality mulberry leaves for a second crop and the problem is intensified with addition of Tetranychys sp. and Panonychus sp. mites in to the pest list of mulberry, which are impairing the quality of mulberry leaves and adversely affecting the biological and economic parameters of silkworm and resultant cocoons. In this background an effort has been made to develop a simple field level damage assessment system for mite injury in mulberry at Central Sericultural Research and Training Institute, Pampore, Jammu and Kashmir, India during 2010 cropping season. A modified method of diseases assessment in mulberry was used to record the mite injury. Mite infestation and percent damage indices were computed following standard procedure and correlated with few metrological parameters. Mite infestation started with 25 percent in the beginning of the study to reach 62 percent during August end from which started declining to reach a low of 18 percent by October end which coincided with initiation of leaf senescence. The percent damage index too followed the similar trend. All the climatic factors influenced positively and significantly in majority on the mite infestation and damage
Mulberry, mites, leaf damage assessment