EVALUATION OF BOTANICALS AND RICE GERMPLASM AGAINST RICE HISPA DICLADISPA ARMIGERA (OLIVIER).
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Date
2019-07-22
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CSKHPKV, Palampur
Abstract
The present investigations entitled “Evaluation of botanicals and rice germplasm against rice hispa, Dicladispa armigera (Olivier) were undertaken at CSK Himachal Pradesh Krishi Vishvavidyalaya, Rice and Wheat Research Centre, Malan and adjoining farmer’s field, Jia during 2018. In the present studies, seven botanicals viz., camphor oil, cedarwood oil, eucalyptus oil, lemongrass oil, neemazal, melia, eupatorium along with standard check monocrotophos @ 1000, 1000, 1000, 1000, 1000, 2500, 2500 and 850 ml ha-1, respectively were evaluated. Order of efficacy of insecticides among botanicals was cedarwood oil > neemazal > camphor oil > eucalyptus oil > lemongrass oil > melia > eupatorium. Among botanicals cedarwood oil @ 1000 ml ha-1 was found most effective and was statistically at par with standard check monocrotophos and also with neemazal. Eupatorium @ 2500 ml ha-1 was found least effective for the management of rice hispa. The results on the yield obtained in case of botanicals revealed that highest yield of rice grains were recorded from plots treated with cedarwood oil (49.20 q ha-1) followed by neemazal (48.80 q ha-1). The per cent increase in yield of rice over other botanicals and untreated control was highest in cedarwood oil (26.80%). Among botanicals incremental cost benefit ratio was highest in neemazal (1:6.6) followed by cedarwood oil (1:6.4) and lowest in eupatorium (1:3.3). In screening trial, among sixty four rice genotypes no entry was found free from hispa attack. The leaf infestation due to rice hispa varied from 15.00 to 100.00 per cent. The rating of rice genotypes on the basis of rice hispa grading scale revealed that 5 rice genotypes viz., Naggar Dhan, HPR 2613, Sukara Dhan, HPR 2617 and ACC 19186 were found resistant and one rice genotype (IC 3131180) was moderately susceptible. Thirty eight rice genotypes were found susceptible and twenty genotypes were highly susceptible. No egg laying was observed in moderately resistant rice genotypes. The highest yield of 20.00 g per hill was obtained in HPR 2613 whereas lowest yield of 1.80 g per hill was obtained in Roda Dhan.
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