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Generation of a bio-intensive strategy using chitosan formulations and Ampelomyces quisqualis for the management of powdery mildew of grapes

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Title Generation of a bio-intensive strategy using chitosan formulations and Ampelomyces quisqualis for the management of powdery mildew of grapes
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Creator Ratna U. Thosar, Indu Sawant, Vijayshree M. Chavan, Sanjay D. Sawant, Sujoy Saha and A. Vikram Suthakar
 
Subject Chitosan, Powdery mildew, Grapes, Erysiphe necator, Ampelomycesquisqu alis
 
Description Not Available
Powdery mildew caused by Erysiphe necator is one of the most important diseases of
grapevine in India. It affects the grape production by causing significant reduction in yield
and quality of grapes. Chitosan is a deactivated derivative of chitin and the efficacy of
three chitosan formulations, Chitosan fulvate @ 2ml/L, Chitosan oligosaccharides @
2ml/L, Chitosan @ 4ml/L were evaluated against powdery mildew. The physiological loss
in weight of berries was also assessed. During the fruiting seasons of 2018-2019 and 2019-
2020, chitosan formulations were evaluated both as solo treatments and in alternation with
Ampelomyces quisqualis @ 5ml/L. All Chitosan formulations effectively inhibited
powdery mildew on leaves and berries when compared to untreated control. Among solo
treatments, chitosan exhibited lower PDI (17.76 and 5.29) on leaves than untreated control
(24.28 and 13.12) during 2018-2019 and 2019-2020 respectively. In case of bunches
similar trend was observed with PDI 23.39 and 9.90 against untreated control 30.31 and
17.18 in both seasons. However, the formulations were found more effective when used in
alternation with Ampelomyces quisqualis. During 2018-2019 and 2019-2020, Chitosan /
Ampelomyces quisqualis treatment recorded significantly lower PDI of powdery mildew
on leaves i.e.12.55 and 4.77than the untreated control with PDI 24.28 and 13.22
respectively. In case of bunches, treatment Chitosan / Ampelomyces quisqualis showed the
lowest disease severity with PDI 19.28 and 8.98 against untreated control with PDI 31.60
and 17.18 in both the seasons respectively. The applications of formulation containing
chitosan alternated with sprays of Ampelomyces quisqualis (5ml/L) showed least disease
as well physiological loss in weight of grapes. All chitosan formulations were effective in
minimizing physiological loss in weight of grapes as compared to control. Among all
treatments, Chitosan / Ampelomyces quisqualis treatment recorded the lowest PLW
i.e.13.94 and 13.90, whereas untreated control showed the highest PLW i. e. 15.85 and
15.87 during both seasons respectively. Results showed that chitosan can be effectively
used in powdery mildew management, either alone or in alternation with the bioformulation
of Ampelomyces quisqualis.
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Date 2021-07-29T04:51:57Z
2021-07-29T04:51:57Z
2020-09-01
 
Type Research Paper
 
Identifier Ratna U. Thosar, Indu Sawant, Vijayshree M. Chavan, Sanjay D. Sawant, Sujoy Saha and A. Vikram Suthakar (2020) Generation of a bio-intensive strategy using chitosan formulations and Ampelomyces quisqualis for the management of powdery mildew of grapes. Int.J.Curr.Microbiol.App.Sci 9(10): xx-xx
2319-7706
http://krishi.icar.gov.in/jspui/handle/123456789/50941
 
Language English
 
Relation Not Available;
 
Publisher Not Available