National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
The pests appeared on 37th standard week (September 2nd week) on rice crop with an infestation of average 0.47 gundhi bug per hill. The gundhi bug population increased and gradually reached peak level of 3.035 gundhi bug per hill on 41st standard week (October 2nd week). At that time, average max temperature was 35.77 °C and minimum temperature was 28.82 °C, maximum relative humidity was 90 % and minimum 51.57 %, average wind velocity was 1.56 km/hr and average sunshine hour was 8.68 hours. One application of seven chemical insecticide viz., Imidacloprid 17.8 SL @ 100 ml/ha, Thiamethoxam 25 % WP @ 100g/ha, Chloropyrifos 50 % EC @ 2.5 lit/ha, Carbaryl 50 % WP 625 g/ha, Triazophos 40 % EC @ 875 ml/ha, Cartap hydroclorid 20 % SP @ 500 g/ha and Cypermethrin 25 % EC @ 250 ml/ha were evaluated against rice gundhi bug Leptocorisa acuta Thunberg. Maximum Per cent population reduction of gundhi bug per hills and B: C ratio were observed in Imidacloprid with (71.80 % and 1:3.36) respectively. Which are followed by Carbaryl (70.26 % and 1:3.22)> Thiamethoxam(67.63 and 1:3.27) >Chloropyrifos (66.71 and 1:3.35)> Triazophos (58.17and 1:3.00) >Cypermethrin (54.55 and 1:2.98) Cartap hydroclorid (52.21and 1:2.83) and > Untreated Control (1:2.29) respectively.
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