Varietal incidence and control of stone weevil Sternochetus mangiferae Fabricius.
Studies on the incidence of the curculionid Sternochetus mangiferae on some mango varieties (Alphonso, Langra, Mulgoa, Pairi, Totapuri, Banganpalli, Suvarna Rekha, Jahangir and Bombay Green) were carried out in Karnataka, India, in 1975-79. There was a high incidence of the pest in fallen fruits of all the varieties examined, infestation ranging from 52.39% in Langra to 83.15% in Jahangir. The incidence in 1977 was much higher than that during 1975. Infestation of fruits sampled from trees ranged from 48% in Langra to 87% in Totapuri, which indicated the susceptibility of all the varieties to the pest. Banganpalli was also highly susceptible, with 82% infestation. Infestation of other varieties was 52-75%. Four sprays each of 0.1% carbaryl, 0.05% monocrotophos or 0.06% dimethoate applied at intervals of 21 days commencing from the time of fruit set gave promising results in reducing the level of infestation by the pest.