USEFUL COTTON GERMPLASM FIELD TOLERANT TO JASSIDS AND BOLLWORMS
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Abstract
Jassids and bollworms constitute the most serious insect enemies of cotton
affecting yield and quality considerably. The Central Institute for Cotton
Research, Nagpur maintains a global collection of cotton genetic resources
(Table 1) of which 4268 in G. hirsutum and 1680 in G. arboreum have earlier
been catalogued for major economic characters. So far no systematic effort
was made by anyone to evaluate a large number of accessions of these two
species for the field reaction to jassids and incidence of bollworms including
pink (Pectinophora gossypiella), spotted (Earias vittella) and American bollworm
(Heliothis armigcra) over a continuous period of 3 seasons under field cenditions
in a systematic manner. In this paper, results of study conducted with 254
accessions of G. hirsutum and 201 of G. arboreum for screening against jassids
and 473 and 201 accessions of G. hirsutum and G. arboreum respectively for
bollworms are discussed