MANAGEMENT OF LEAF FOLDER (Cnaphalocrosis medinalis Guenee) INFESTING RICE
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Date
2019
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Birsa Agricultural University, Ranchi
Abstract
Rice (Oryza sativa L.) is one of the most important cereal crops worldwide. It is the
major staple food in Asian country as well as India and the state of Jharkhand. India has the
world’ s largest area under Rice (Oryza sativa L.) with 44.1 million ha and is the second largest
producers of rice to the tune of 105.48 million tons in 2014-15, next to China (Anonymous,
2016). The crop is usually badly affected by half of a dozen of major insect pests. Out of these,
leaf folder is one of the major insect pests of rice. It causes 30-80 % yield losses especially
during epidemic situation.
In order to manage rice leaf folder, the present thesis protocol “Management of leaf
folder (Cnaphalocrocis medinalis Gn.) infesting rice” was undertaken with four major
objectives namely monitoring of the pest, varietal screening of the pest, bio-efficacy evaluation
of newer molecule of insecticide against the pest as well as use of HPR and need based judicious
application of insecticide for management of the pest. The field experiments were conducted in
the fields of Rice Research Farm of Birsa Agriculture University, Kanke, Ranchi during Kharif
season, 2018.
It was found that there was positive correlation between maximum atmospheric
temperature and incidence of pest. The results of field studies on host plant reaction of 28 rice
genotypes against leaf folder revealed that rice genotypes namely Sinna Sivappu, MSM-3, MTU
1245, Suraksha, RP-2068-18-3-5, MSM-1, MSM-2, W1263, KAUPTB 0627-2-11-14-15, Kavya
were found promishing against the pest species, receiving damaged leaves due to the pest below
10 percent.
The experimental findings also revealed that ready mix new combination of insecticidal
product i.e. flubendiamide 480 SC plus thiacloprid 480 SC @ 250 ml/ha applied at 30 DAT, 50
DAT and 80 DAT (date of transplanting) could be found most effective insecticide resulting in
the highest grain yield of rice (46.50 q/ha) with maximum benefit cost ratio (6.2:1) owing to the
minimum incidence of rice leaf folder.
The experimental findings revealed that use of host plant resistance (HPR) coupled with
judicious application of newer molecule of insecticide i.e. flubendiamide 480 SC @ 50 ml/ha
applied as foliar spray at 30, 50 and 80 DAT could be found highly effective in substantial
reduction in the incidence of leaf folder which, in turn, realized appreciable enhancement in
additional yield over the untreated control in all the five test varieties of rice amounting to 20.0,
16.10, 14.00, 11.22 and 10.10 q/ha in case of Lalat, IR 64 (drt-1), Sahbhagi Dhan, BVS-1, TN-1
respectively.
In brief, it may be concluded that use of HPR (host plant resistance) coupled with
judicious application of the appropriate insecticide could be highly effective for minimization in
the incidence of leaf folder and optimization of realization of higher grain’s yield of rice, higher
net return and B:C ratio with the least harm or no harm to the rice agro-ecologies.
Description
MANAGEMENT OF LEAF FOLDER
(Cnaphalocrosis medinalis Guenee)
INFESTING RICE