Vol. 6, Issue 6 (2018)
Effect of genotypes of sorghum seed on population growth of rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae)
Author(s): SK Patil, Adam Bulo and SR Kulkarni
Abstract: The investigation was conducted to evaluate the effect of twenty three sorghum genotypes on population growth of rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae) under laboratory condition during 2016-2017. Among the tested genotypes, less ovipositional preference (3.00 to 5.00 eggs/100 seeds) by S. oryzae to small to medium size seeds with higher incubation period (6.33 to 5.67 days/100 seeds), less corneousness score (1.23 to 2.17), maximum hardness of seed (9.17 to 7.89 kg/seed), less percent adult emergence (5.00 to 10.00 %) and maximum developmental period (38.67 to 34.13 days) with less growth index (0.05 to 0.16) were recorded in the genotypes viz., IS 2305, IS 2205, M 35-1 and IS 18551. It indicated that the minimum growth index in least preferred varieties in which S. oryzae have longer developmental period and maximum growth index in most preferred varieties of sorghum.
As regards the correlation coefficient studies, the seed corneousness was significantly positively correlated with eggs laid by female weevil (r= 0.721**), adult emergence (r= 0.638**) and growth index (r= 0.725**) and it was significantly negatively correlated with the incubation period (r= -0.672**), larval-pupal period and adult developmental period (r= -0.746**). Adult emergence was found positively correlated with growth index (r= 0.937**) and negatively correlated with incubation period (r= -0.974**) and adult developmental period (r= -0.865**). Adult developmental period was significantly negatively correlated with number of eggs (r= -0.923**) and growth index (r= -0.951**). Growth index was significantly positively correlated with number of eggs laid (r= 0.971**) and it was significantly negatively correlated with incubation period (r= -0.956**).
Pages: 2345-2350 | 279 Views 54 Downloads
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How to cite this article:
SK Patil, Adam Bulo, SR Kulkarni. Effect of genotypes of sorghum seed on population growth of rice weevil, Sitophilus oryzae (L.) (Coleoptera: Curculionidae). Int J Chem Stud 2018;6(6):2345-2350.
