EPIDEMIOLOGY AND INTEGRATED MANAGEMENT OF CUCUMBER MOSAIC VIRUS DISEASE OF PUMPKIN
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Date
2023
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Abstract
Pumpkin (Cucurbita moschata Duch.) belongs to the family Cucurbitaceae, is one of the
important vegetable crops grown in India and abroad. Production of pumpkin is limited by a
number of biotic and abiotic factors, among which cucumber mosaic virus disease caused by
Cucumber Mosaic Virus (CMV) has become a major threat in its cultivation. Considering the
importance of the disease, experiment was carried out to study the epidemiology and integrated
management of cucumber mosaic virus disease of pumpkin in Assam in the experimental field of
Department of Plant Pathology, BNCA, AAU during 2022-23 with 2 objectives, viz., (i) To study
the effect of dates of sowing on incidence of cucumber mosaic virus disease of pumpkin and its
aphid vector. (ii) Integrated Management of cucumber mosaic virus disease of pumpkin.
In the six dates of sowing, highest (100%) disease incidence was observed in the crop sown on
18.10.22 (D4), 02.11.22 (D5) and 17.11.22 (D6) and lowest disease incidence (50.00) was
recorded in the first date of sowing 3.09.22 (D1). Correlation studies revealed a positive
significant relationbetween the disease incidence and aphid vector population in all the six dates
of sowing and also with bright sunshine hour and diurnal variation on crop sown on 3.09.22 (D1)
and 18.09.22 (D2). Disease incidence had significant negative correlation with maximum
temperature, minimum temperature, day temperature and night temperature on the crop sown on
3.09.22(D1),18.09.22(D2),3.10.22(D3) and 18.10.22(D4). The aphid population had negative
significant correlation with maximum temperature, day temperature and night temperature during
the first four dates of sowing D1, D2, D3 and D4, whereas minimum temperature had a negative
significant correlation with aphid population during the first three dates of sowing D1(3.09.22),
D2(18.09.22) andD3(3.10.22). The disease incidence could be predicted up to 93-97 per cent
accurately with aphid population only in different dates of sowing. Sowing time of pumpkin also
affected the yield parameters of the crop. highest fruit yield was obtained in D2(18.09.22).
Out of eighteen pumpkin cultivars evaluated against cucumber mosaic virus disease, six were
moderately susceptible, eleven were susceptible and one cultivar was observed to be highly
resistant against the disease.
Among the eleven treatments evaluated for management of the disease, treatment T10
consisting of two rows of maize as barrier crop + seed treatment with HCl (2%, 10min) + foliar
spray of Imidacloprid 17.8 SL @2.0ml/10L at 30 DAS + spray with bioagent (Beauveria bassiana)
@ 1% at 45 DAS + spray with neem oil (3ml/l) at 60 DAS has resulted in least disease incidence
(16.67%) and fruit yield of 83.89q/ha. Treatment T10 also resulted in highest benefit: cost ratio of
2.53.