EVALUATION OF TRANSLAMINAR FUNGICIDESAND THEIR TANK MIXED APPLICATION WITH ECONOMICS FOR MANAGEMENT OF LATE BLIGHT OF POTATO (PHYTOPHTHORA INFESTANS) IN SUBTROPICAL PLAINS OF INDIA

Mehi Lal; Sorabh Chaudhary; Saurabh Yadav; Sanjeev Sharma; Manoj Kumar; S K Chakrabarti

doi:10.56093/potatoj.v51i2.152001

Authors

Mehi Lal CPRI Shimla,India
Sorabh Chaudhary
Saurabh Yadav
Sanjeev Sharma
Manoj Kumar
S K Chakrabarti

https://doi.org/10.56093/potatoj.v51i2.152001

Keywords:

Potato, Late blight, Fungicides, Spraying, Management

Abstract

Late blight, incited by Phytophthora infestans (Mont.) de Bary is the major disease of potato under the class
of foliar diseases. Chemical methods are being used for the effective management of late blight. However, this pathogen
is more vulnerable against specific mode of chemicals (systemic fungicides), which may develop resistant. The field
efficacy of translaminar fungicides and their tank mixed application with economics were evaluated in two different
experiments for managing late blight of potato during three consecutive years. In first experiment it was observed that
dimethomorph 50%WP @ 0.2% showed least average terminal disease severity (14.54%) with highest disease controlled
(84.15%) followed by ametoctradin 27% + dimethomorph 20.27% SC @ 0.2% and cymoxanil 8 + mancozeb 64%WP @ 0.3%.
In second experiment, under the tank-mixed application dimethmorph 50%WP @ 0.1% + mancozeb 75%WP @ 0.2% showed
less average terminal disease severity (22.67%) with highest disease controlled (75.97%) along with highest tuber yield
(40.70 t/ha) and highest B:C ratio (2.16) followed dimethmorph 50%WP @ 0.1% + chlorothalonil 75% WP @ 0.2%, which
was statistically significant. These treatments are also least affected by environmental factors like rainfall. These new
fungicides and their tank-mixed sprays were found effective for managing the disease and moreover these tank-mixed
sprays can be used to avoid development of resistance against pathogen.

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