Management of Major Arthropod Pests of Summer Okra
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Date
2019
Authors
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Publisher
MPUAT, Udaipur
Abstract
Investigation on “Management of Major Arthropod Pests of Summer Okra" was
conducted during summer 2016 and 2017 at RARS, Karjat, Dr. BSKKV Dapoli District
Ratnagiri, Maharashtra. Among nine genotypes/ varieties of okra, none of the cultivars was
found to be free from pest infestation in the both year. The highest jassids population was
found in variety Parbhani Kranti (21.68 jassids); whereas, variety Arka Anamika showed less
jassids population (14.54). The highest aphids population was found in variety Varsha
Upahar (16.88 aphids); whereas, variety Punjab Padmini showed less aphids population
(12.79). The maximum whitefly population was found in variety Varsha Uphar (7.72
whitefly); whereas, variety Akola Bahar showed minimum whitefly population (4.77). The
minimum shoot damage was recorded on variety Akola Bahar (14.87 per cent), whereas the
maximum damage was recorded on Punjab Padmini (25.68 per cent). The per cent fruit
damage revealed that the infestated fruit damage ranged from 26.12 to 33.08 per cent on
different genotypes/ varieties. The variety Akola Bahar recorded less damage (26.12 per
cent) to fruits as compared to rest of the other varieties.
Okra crop was cultivated at 3 different sowing dates in year 2016 and 2017 during
summer season (3rd week of January, 1st week of February and 3rd week of
February).Considering the average data of two years, the incidence of jassids was recorded
maximum population 22.74 jassids/ 3 leaves in 10th week after sowing in late sowing
whereas it was recorded minimum in regular sowing i.e. 1.06 jassids/ 3 leaves in 4th week
after sowing. In case of aphids the maximum population was recorded 19.78 aphids/ 3
leaves in 11th week after sowing in late sown crop. Regarding the whiteflies the maximum
population was recorded 12.73 whitefly/3 leaves 11th week after sowing in late sown crop. In
case of shoot and fruit borer the maximum shoot and fruit borer infestation was recorded
33.70 per cent in 9th week after sowing in late sown crop.
* Ph.D. Scholar, Department of Entomology, RCA, MPUAT, Udaipur (Raj.)
** Head., Department of Entomology, RCA, MPUAT, Udaipur (Raj.)
Regarding the population dynamics of the major arthopods, the maximum jassids,
aphids whitefly population and shoot and fruit borer damage was recorded on fourth week
of April (25.16 jassids / 3 leaves, 25.16 aphids / 3 leaves, 9.96 whitefly / 3 leaves and 22.46
per cent shoot and fruit borer damage, respectively). Regarding correlation coefficient study
between pest population and weather parameters indicated that RHE and BSS showed
highly significant negative correlation, whereas, MaxT (0.753), showed significant positive
correlation, with Shoot and fruit infestation.
Regarding the efficacy of some insecticide and biopestiside against major arthropods
all the treatments were significantly superior over control. Treatment T3 (1st spray
Thiamethoxam 25% WG and 2nd spray Thiodicarb 75% WP was found effective treatment for
management of aphids, jassids and whitefly whereas Treatment T5 (Spiromesifen 22.9% SC
1st spray and 2nd spray Thiodicarb 75% WP and 3rd .spray Emamectin Benzoate 5% SG) was
found effective for management of shoot and fruit borer infestation (weight as well as
number basis).The maximum yield was also recorded in Treatment T5.
Description
Management of Major Arthropod Pests of Summer Okra
Keywords
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Citation
Jalgaonkar, V.N. and Mahla, M.K.