Studies On the Varietal Preference and  Diurnal Activity of Oxya Hyla Hyla (Serville)  (Orthoptera: Acrididae) On Rice Agro–Ecosystem

Manika Das; D. C. Ray

Volume : III, Issue : VI, June - 2013

Studies On the Varietal Preference and Diurnal Activity of Oxya Hyla Hyla (Serville) (Orthoptera: Acrididae) On Rice Agro–Ecosystem

Manika Das, D. C. Ray

Abstract :

Varietal preference and Diurnal activity of Oxya hyla hyla was studied in Dargakona of Cachar District in Assam. Investigations were made on twelve varieties of rice in three seasons (Aus, Sali and Boro) during 2010– 2011. Among them Luit (58.96%), Aizong (63.79%) and Guchiboroa (68.87%) were observed to be the most Susceptible varieties during all the three seasons. The diurnal activity study indicated that the maximum activity by the grasshopper species was observed at 10– 11 hrs. during Aus season in 1st year and 11– 12 hrs. in 2nd year. In Sali season peak activity was noticed at 15– 16 hrs. in 1st year and in 2nd year it was recorded at 9– 10 hrs whereas in Boro season during 1st year the maximum activity was observed from 10– 11 hrs and 16– 17 hrs. during 2nd year. The overall maximum activity was recorded at 9– 12 hrs. during all the seasons in both the years. ‘t’ test indicated negatively significant difference during Aus vs Sali (‘t’= –3.5, p<0.05) at 15–16 hrs. in 2010 and Aus vs Boro (‘t’= –2.99, p<0.05) at 16–17 hrs. during 2011.