SCREENING OF RECENT RICE VARIETIES AGAINST LEAF FOLDER, Cnaphalocrosis medinalis GUENEE (PYRALIDAE: LEPIDOPTERA) AND ITS MANAGEMENT WITH NEW INSECTICIDES
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Date
2016
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Acharya N.G. Ranga Agricultural University
Abstract
Studies on the response of twenty one rice varieties against rice leaf folder
Cnaphalocrocis medinalis (Guenee) on various morphological, biochemical aspects
of host plant resistance and efficacy of certain new insecticides were conducted
during kharif 2015 at Agricultural college farm, Bapatla, Andhra Pradesh.
The cumulative mean per cent of leaf folder damage in twenty one rice
varieties indicated that the lowest leaf damage was recorded in BPT-2231 (7.10%)
and the highest damage was observed in BPT-5204 (18.20 %) followed by BPT-
2570 (16.90%). According to International Rice Research Institute (IRRI), Standard
Evaluation System (SES) the ratings were given to the varieties against leaf folder
damage. The varieties were categorized into ten resistant (under a rating of ‘1’)
eleven moderately resistant (under a rating of ‘3’). Highly resistant (under a rating
of ‘0’) and highly susceptible (under a rating of ‘9’) varieties were not recorded.
Among morphological characters, leaf length did not influence the leaf folder
incidence whereas positive significant correlation was observed with leaf width.
Among biochemical constituents nitrogen, protein and chlorophyll content
exhibited positive significant correlation whereas silica was negatively correlated
with leaf folder damage.
Among different insecticidal treatments, flubendiamide 480 SC @ 0.2 ml l-1
(T1) was found most effective treatment with lowest (4.93%) mean per cent the leaf
folder damage ( 63.20 per cent reduction over control) followed by cyantraniliprole
10 OD @ 1.2 ml l-1 (T6) (7.17%), chlorantraniliprole 18.5 SC @ 0.3 ml l-1 (T5)
(7.06%), fipronil 5 SC @ 1.2 ml l-1 (T7) (7.76%), cartap hydrochloride 50 SP @ 2 g
l-1 (T8) (8.20%) with 51.26, 50.81, 49.67 and 44.95 per cent reduction over control,
respectively. The lowest mean per cent reduction of leaf damage was recorded with
dinotefuran 20 SG @ 0.4 g l-1 (T3) (17.41%) over control followed by chlorpyrifos
20 EC @ 2.5 ml l-1 (T2) (10.09%) and acephate 95 SC @ 1.5 ml l-1 (T4) (9.28%)
with 35.90, 39.83 per cent reduction over control, respectively indicated that their
reduced efficacy against rice leaf folder.
Description
D5266
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