Organic management of Pest and Diseases in Potato
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Date
2021
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Abstract
In the present investigation, efforts have been made to evaluate the
comparative efficacy of two different forms of copper fungicides viz., copper
oxychloride and copper hydroxide against late blight of potato incited by Phytophthora
infestans (Mont.) de Bary under the different spray schedule (10 numbers of sprays at 4
days interval and 8 numbers of sprays at 5 days interval) with a view to select the most
effective one for management of the disease. Field experiment performed revealed that
both the fungicides could control late blight to a varying extent. Among the fungicides,
copper hydroxide proved to be the best in reducing late blight severity. The fungicide
could provide highest protection (73.74%) to moderately late blight resistant variety
(Kufri Himalini) and 47.23% protection to the susceptible variety (Kufri Jyoti) when
applied 10 numbers spray of copper hydroxide @0.2% at 4 days interval. This treatment
gave maximum tuber yield 15.73 and 10.26 t/ha in K. Himalini and K. Jyoti
respectively. Although maximum net return Rs. 54,200 with a corresponding
incremental benefit-cost ratio of 2.25 was recorded in this treatment (10 numbers spray
with copper hydroxide @0.2% at 4 days interval) but at the same rate of application the
highest B:C ratio (2.41) obtained in the treatment of copper oxy-chloride with a net
return of Rs. 43,500.
An another study on comparative efficacy of four microbial bioformulations
viz., Biometa, Biosona, Biollium and Biogreen against Red ant (Dorylus
orientalis Westwood) on potato was evaluated during 2018-2019 and 2019-2020. The
formulation, Biosona (combined tuber treatment @6g/kg tuber and soil application with
enriched compost @ 2 t/ha) gave highest tuber yield of 11.23 t/ha with a minimum
nfestation rate of 15.71% tuber damage and maximum protection (47.02%) against red
ant and also gave a satisfactory profit of Rs. 19,700 with a B:C ratio of 1.48.
The third investigation was carried out during 2018-2019 and 2019-2020
to evaluate the comparative efficacy of four microbial bio-formulations viz., Biometa,
Biosona, Biolium and Biogreen against Aphid (Myzus persicae and Aphis gossypii) on
potato. Biolium (Verticilium lecani) @0.5% spray gave highest tuber yield of 10.27 t/ha
with a highest protection 33-66 % against aphid. This treatment gave a satisfactory
profit of Rs. 10,400 with a B:C ratio of 1.44.