International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2017, Volume : 5, Issue : 4
First page : (1531) Last page : (1538)
Article doi: http://dx.doi.org/10.18782/2320-7051.5447
Studies on Seasonal Incidence of Lablab Bug, Coptosoma cribraria (Fabricius) in Dolichos Bean, Lablab purpureus L. and their Relation with Weather Parameters
S. Srinivasa Reddy*, C. Narendra Reddy, C. Srinivas, A. Manohar Rao and S. Narender Reddy
Dept. of Entomology, College of Agriculture, Rajendranagar, PJTSAU, Hyderabad-500030
*Corresponding Author E-mail: srinivasreddyagri@gmail.com
Received: 15.07.2017 | Revised: 26.07.2017 | Accepted: 28.07.2017
ABSTRACT
The present study was carried out to find the correlation between seasonal incidence of lablab bug Coptosoma cribraria with weather variables during kharif 2015-16 and
kharif 2016-17 respectively. The results on the seasonal incidence of major insect pests revealed that the incidence of lablab bug, Coptosoma cribraria was recorded from second week of October during 41st standard week to 4th standard week in kharif 2015 – 16. The highest incidence of C. cribraria population was observed with two peaks i.e., at 47th standard week (3rd week of November) and 49th standard week (1st week of December) with 5.3 and
5.1 bugs per plant, respectively while, the population of Coptosoma increased gradually from third week of October during 42nd standard week to 4th standard week in kharif 2016-17 and the highest incidence of Coptosoma population were recorded during 47th, 50th and 1st standard weeks with 4.9, 4.4 and 4.4 bugs per plant, respectively. The relationship between the C. cribraria bug population with preceding one week (one week lag) weather parameters during kharif 2015-16 revealed that there was a significant negative correlation with maximum temperature (-0.590*) and sunshine hours (-0.546*) at 5 % level of significance while, Positive significant correlation with evening relative humidity (0.576*) at 5% level of significance and wind speed (0.645**) at 1 % level of significance were recorded. During kharif 2016-17, maximum temperature (-0.554*) and minimum temperature (-0.578*) were negatively significant with C. cribraria population at 5% level of significance whereas mean temperature (-0.645**) was negatively correlated at 1% level of significance.
Key words: Lablab bug, C. cribraria, Seasonal incidence, Correlation, Multiple regression
Full Text : PDF; Journal doi : http://dx.doi.org/10.18782
Cite this article: Reddy, S.S., Reddy, C.N., Srinivas, C., Rao, A.M. and Reddy, S.N., Studies on Seasonal Incidence of Lablab Bug, Coptosoma cribraria (Fabricius) in Dolichos Bean, Lablab purpureus L. and their Relation with Weather Parameters, Int. J. Pure App. Biosci.5(4): 1531-1538 (2017). doi: http://dx.doi.org/10.18782/2320-7051.5447
