SYSTEMATIC STUDIES ON ARMYWORMS AND CUTWORMS ASSOCIATED WITH ECONOMICALLY IMPORTANT CROPS OF SOUTHERN KARNATAKA
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Date
2019-07-30
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BANGALORE
Abstract
The study on armyworms and cutworms was carried out at UAS, GKVK,
Bengaluru. A survey was undertaken to assess the incidence of armyworms and
cutworms on maize, chilli, soybean, sunflower, castor, potato and ginger in seven
districts viz., Chikkaballapur, Bengaluru Rural, Bengaluru Urban, Hassan, Mandya,
Mysuru and Tumkur during Kharif and Rabi in 2018-19. Among all the surveyed
locations, high incidence (77.26 %) of fall armyworm was observed on maize in Tumkur
district. Among the crop surveyed (chilli, soyabean, sunflower and castor), high
incidence (86.66%) of Spodoptera litura have recorded in Bengaluru North district.
Incidence of Agrotis segetum has 7.6 per cent on potato in Hassan. During the study 259
specimens were collected and examined which represented 13 species, four genera
belonging to three subfamilies viz., Xyleninae, Hadenine and Noctuinae. Subfamily
Xyleninae has represented by six species under the genus, Spodoptera viz., S. exigua, S.
litura, S. mauritia, S. exempta, S. frugiperda and S. pecten. Subfamily Hadeninae has
represented by four species belongs to two genera. The genus Mythimna had two species
viz., M. separata and M. reversa and the genus Leucania had two species viz., L. loreyi
and L. roseilinea. Subfamily Noctuinae represented by three species under the genus,
Agrotis viz., A. ipsilon, A. segetum and A. spinifera. These species were distinguished
based on male genitalia characters viz., shape and structure of uncus, tegumen, vinculum,
saccus, valvae, juxta, aedeagus and vesica. Description of each species is provided along
with keys for their identification.
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