STUDIES ON THE MANAGEMENT OF FUNGAL FOLIAR DISEASES OF GROUNDNUT IN GUNTUR DISTRICT OF ANDHRA PRADESH
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Date
2017
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Acharya N.G. Ranga Agricultural University
Abstract
Investigations on “Studies on the management of fungal foliar diseases of
groundnut in Guntur district of Andhra Pradesh” was carried out in the Agricultural
College Farm, Bapatla, Guntur district, Andhra Pradesh during late kharif 2016-17.
A survey was conducted during rabi 2016-17 in Guntur district of Andhra
Pradesh. Fungal foliar disease severities were recorded in the surveyed villages of
Karlapalem and Pittalavanipalem mandals of Guntur district at 30-35 and 55-60
DAS. Mean ELS PDI of Guntur district at 30-35 DAS was 12.86 %. Mean LLS PDI
of Guntur district was 12.87 % at 30-35 DAS and 30.73 % at 55-60 DAS.
During late kharif 2016-17, ELS PDI of K-6 and Vemana showed significant
positive correlation with mean minimum temperature (r = 0.556* and r = 0.604*
respectively). Regression analyses for PDI of ELS and weather factors revealed that
maximum temperature and minimum temperature have influenced the development
of ELS on the genotypes RSB-87, Vemana, JCG-88, AVT-1666, AVT-1638 where
as maximum temperature, minimum temperature and morning relative humidity
influenced disease development on GG-2, Kisan, ALR-3, K-9, Abhaya, Narayani,
ALR-1, Anantha and K-6.
Late leaf spot PDI of K-6 showed significant positive correlation with
sunshine h (r = 0.592*) and negative correlation with minimum temperature
(r = -0.819*), rainfall (r = -0.568*) and all other tested genotypes showed significant
negative correlation with mean minimum temperature.
Rust PDI on all the test genotypes showed significant negative correlation
with mean minimum temperature. Regression analyses with PDI of LLS and rust
with weather factors revealed that maximum temperature and minimum temperature
influenced the development of LLS and rust severity in all the genotypes.
Out of 14 genotypes (including check) evaluated for their resistance to fungal
foliar diseases, RSB-87, Kisan, Vemana, GG-2, K-9, AVT-1638, Abhaya, Anantha,
JCG-88, AVT-1666, ALR-1 and ALR-3 were moderately resistant and other two
genotypes (K-6 and Narayani) were susceptible to LLS. The genotypes JCG-88,
AVT 1666 and AVT-1638 were resistant, nine genotypes viz., RSB-87, Kisan,
Vemana, GG-2, ALR-3, K-9, Abhaya, ALR-1, Anantha were moderately resistant.
K-6 (check) and Narayani were susceptible to rust.
Studies on management of fungal foliar diseases with fungicides have
revealed that three sprays of tebuconazole + trifloxystrobin 75 WG (50 %+ 25 %
w/w) @ 0.09 % at the occurrence and at two weeks interval recorded the lowest
severity of ELS (25.56 %), LLS (32.42 %) and rust (18.56 %) and improved dry pod
weight, number of pods per plant and was the most economical.
Description
D5443
Keywords
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