MOLECULAR CHARACTERISATION OF ISOLATES OF Phytophthora infestans (Mont.) de Bary CAUSING LATE BLIGHT DISEASE IN POTATO AND TOMATO
KrishiKosh
View Archive InfoField | Value | |
Title |
MOLECULAR CHARACTERISATION OF ISOLATES OF Phytophthora infestans (Mont.) de Bary CAUSING LATE BLIGHT DISEASE IN POTATO AND TOMATO
|
|
Creator |
SAPTARSHI, GHOSH
|
|
Contributor |
RANGASWAMY, K. T
|
|
Subject |
potatoes, diseases, vegetables, fungi, planting, beverages, phytophthora infestans, biological phenomena, pcr, genotypes
|
|
Description |
Potato and Tomato are important vegetable crops of India and Karnataka, suffer due to many diseases. The oomycete fungus Phytophthora infestans (Mont.) de Bary, the causal agent of late blight of potato and tomato is one of the most devastating microbial pathogens worldwide. Two isolate of P. infestans from tomato each from Kolar and GKVK and one isolate from potato from Hassan were characterized for mitochondrial haplotypes, mating types and metalaxyl sensitivity. The two isolates from tomato and the one from potato were found to be of Ia mitochondrial haplotype. This suggested a change in population and migration of P. infestans. The isolates were found to be of A2 mating type according to the restriction digestion profiles obtained. The potato isolate from Hassan and the tomato isolate from GKVK were found to be insensitive to metalaxyl. The tomato isolate from Kolar was found to be moderately sensitive to metalaxyl. In vitro efficacy of new fungicide molecules like metalaxyl, Cymoxanil + Mancozeb, Fenamidone + Mancozeb, Famoxadone + Mancozeb, Famoxadone + Cymoxanil and Trifloxystrobin were tested against the isolates of P. infestans at concentration of 10, 25, 50, 100 and 200 ppm. The study reflected high effectiveness of Cymoxanil+ Mancozeb, Trifloxystrobin and Fenamidone + Mancozeb in inhibition of the pathogen. Trifloxystrobin was the most effective against P. infestans followed by Cymoxanil + Mancozeb, Fenamidone + Mancozeb. Whereas, metalaxyl was found to be least effective even at 200 pp concentration. The effect of date of planting on late blight severity on potato was studied at ARS Madenur, Hassan. Planting of Potato in early June gave 4 times higher yield. Whereas, the late plantings suffered heavy damage in the early stages of the crop growth with high disease severity and yield was significantly reduced. Meteorological data was collected and analyzed which reflected that the incidence and severity of the disease increased with frequent rainfall along with low night temperatures. |
|
Date |
2016-12-22T10:31:40Z
2016-12-22T10:31:40Z 2011-11-18 |
|
Type |
Thesis
|
|
Identifier |
Th-9909
http://krishikosh.egranth.ac.in/handle/1/92049 |
|
Language |
en
|
|
Format |
application/pdf
|
|
Publisher |
University of Agricultural Sciences GKVK, Bangalore
|
|