Studies on Succession and Population Dynamics of Sap Feeders as Influenced by Weather on Sesame

Abstract

Population dynamics of sucking pests of sesame viz. thrips, whitefly, leaf hoppers and aphids were studied. Correlation between the pest population and weather parameters was analyzed and regression equations were developed. Incidence of aphids, leaf hoppers and thrips on sesame crop during kharif season has started on 25 th SMW. Thrips (7.3/ plant) attained peak in the 30 st SMW, whereas, whitefly population reached peak during 27 th SMW with population of 1.7/ plant, whereas, leaf hopper (2.8/plant) and aphid population (12.1/plant) reached the peak in the 31 st SMW. Thrips population exhibited significant positive correlation with mean temperature (r=0.501) and non-significant negative correlation with mean relative humidity(r=-0.312) and rainfall (r=-0.498). Whitefly population showed non-significant positive correlation with mean atmosphere temperature(r = 0.285) and mean relative humidity(r = 0.028) and nonsignificant negative correlative with rainfall (r = -0.452). Leaf hopper exhibited significant positive correlation with mean temperature (r = 0.667) while, non-significant negative correlation with mean relative humidity(r = -0.325) and rainfall(r = -0.296). Aphid population showed significant positive correlation with mean atmosphere temperature(r = 0.667) and non-significant negative correlative with mean relative humidity(r = -0.236) and rainfall (r = -0.444). Incidence of thrips, whitefly, leaf hoppers and aphids on sesame crop during rabi-summer season has started on3 rd SMW. Thrips (3.22/plant), white flies (2.48/plant) leaf hoppers (10.1 /plant) and aphids (12.8/plant) reached the peak in the 10 th SMW. The correlation between weather parameters and sucking pest population followed the pattern similar to kharif season. Regression analysis data of revealed that the multiple non-linear regression equations are sufficient to predict the pest population with prevailing weather parameters.

Influence of Prevailing Weather Parameters on Population Dynamics of Leafhopper Empoasca kerri and Thrips Scirtothrips dorsalis on Groundnut in Semi Arid Ecosystem of Rajasthan

“…According to Yadav et al [8] the "leafhopper population had negative non significant correlation with temperature and positive correlation with relative humidity and total rainfall the findings are in close akin with present findings". Similar work was made by Mer et al [11] and Saritha et al [17]. Ahir et al [12] reported that "the jassid population had negative correlation with temperature, whereas relative humidity and rainfall were found non significant and positive which is partially corroborates with present findings".…”

“…Nayak et al [15] found that "thrips appeared during 33 rd standard meteorological week and reached to peak (3.84/ top bud leaves) in the second week of September which is close agreement with present results". Saritha et al [17] reported that "the incidence of thrips has started on 27 th SMW and attained peak in the 31 st SMW (3.5 thrips/ plant) which is partially conformity with present findings". Yadav et al [8] reported that "the correlation between thrips and temperature was negative but with relative humidity and total rainfall, the correlation was positive and non significant".…”

“…Nayak et al [15] found that "thrips population had significant positive correlation with minimum temperature which is close akin with present results". Saritha et al [17] reported that "the thrips population had significant positive correlation with relative humidity and rainfall which is corroborate with present findings".…”

Population Dynamics of Major Sucking Pests Infesting Rabi Groundnut in West Bengal

“…Even during slight increases, their populations remained insignificant compared to other insects, maintaining minimal activity across the growth season. These findings were partially in accordance with Saritha et al (2020), Ahir et al (2017), Nayak et al (2019), Kandakoor et al (2012) and Priyanka et al (2022). But, the results of this study were found opposing the findings of Shakya et al (2021).…”

Influence of Weather Factors on the Incidence of Major Insect Pests of Sesame (Sesamum indicum L.)

“…The population data for sesame leaf hoppers was recorded at three plant canopy levels viz., lower, middle, and top leaves. Ten plants were selected randomly per spot from five random spots in the plot and data on leafhopper population were collected and the mean population was calculated [3].…”