Diapausing of pink bollworm in relation to the time and formation of cotton bolls
1986
Singh, J.P. | Mor, B.R. | Lather, B.P.S. | Nandal, A.S. (Haryana Agricultural Univ., Hisar (India))
On 'H 777' upland cotton (Gossypium hirsutum Linn.) the bolls formed from the last week of July to the first week of November harboured diapausing larvae of pink boll-worm, Pectinophora gossypiella (Saunders). Bolls formed up to August contained less diapausing larvae (6-20%) than later-formed bolls (26-90%), but the emergence of moths was more (12-50%) from the earlier-formed bolls than from the later-formed ones (1-10%). More than 98% diapausing larvae were recorded in double-seeded bolls. About 57% had only 1 diapausing larva. Diapausing larvae were observed as early as 5 August in 1982 and 30 July in 1983, indicating that some populations of the pink bollworm probably have only 1 generation
显示更多 [+] 显示较少 [-]