STUDIES ON SEASONAL INCIDENCE AND LOSS ESTIMATION IN GUAVA DUE TO TEA MOSQUITO BUG, Helopeltis antonii Signoret (Hemiptera : Miridae)
Loading...
Date
2000
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, DHARWAD
Abstract
"Investigations undertaken during 199 9-2000 at department of
Agricultural Entomology, College of Agriculture, Dharwad. The survey carried
out at MRS, Dharwad on two guava cultivars for seasonal fluctuations of
Helopeltis antonii indicated that the pest incidence was at its peak during
October both on young leaves (18.47%) and fruits (20.53%). No incidence was
observed on flower buds during the study period on Cv. L-49.
The peak infestation level on Cv. Navalur local was observed during
September on young leaves (18.54%) and during December (8.62%) on flower
buds. However, on fruits, it was observed during November (61.33%) and it
vanished from February onwards. However on cashew (during off season) the
peak incidence of the pest during December on young leaves was 11.98 per
cent and on panicles (10.51%).
On Cv. L-49, the pest incidence was at its peak during September
(24.3%) at Navalur location on young leaves and on flower buds no incidence
was observed excepting in December (0.79%). However, on fruits the highest
incidence of 13.66 per cent was observed during September. On Cv. Navalur
local the maximum incidence on young leaves was observed during September
(17.94%) and no incidence was noticed on flower buds. During August 21.77
per cent incidence was observed on fruits.
The desaping action by bug on fruits resulted in to necrotic lesion within
a couple of hours and later on it resulted in scab formation. The dimension of
such spots varied from 1.00 to 2.7 mm in diameter. The fruit infestation
(8.98%) by the bug resulted in reduction in the monitory loss of Rs.4,691.28
per ha. Ascorbic acid, pectin, TSS content and weight of infested fruits reduced
with the increase in infestation level. Whereas pH was highest at increased
infestation level. The order of acceptance by the consumers was decreased as
the level of infestation increased."
Description
Keywords
null
Citation
No. of references 60