Effect of temperature & humdity on population dynamics of insects’ pest complex of cotton crop

Abstract

The current study was directed to investigate the effect of temperature and humidity on insect pest complex of cotton. This study was carried out on the farmer field of a farmer of MouzaMehraywala tehsil and district Rajanpur southern part of the Punjab, Pakistan (29.1044° N, 70.3301° E) in the month of May, 2019 to November 2019. The climatic conditions of the study site were; a Rajanpur lie on 96m above sea level Rajanpur has a desert climate. During the year, there is virtually no rainfall. The average temperature in Rajanpur is 26.0°C | 78.8°F. Precipitation here is about 205 mm / 8.1 inch per year. Our results indicate that’s the correlation of temperature (minimum and maximum), humidity (minimum and maximum), rainfall and weather condition (clear or cloud), it is clear that except temperature there is a positive correlation of jassid population. While among the relation of jassid with different factor there is very weak relation with jassid population regarding temperature (-0.001), the relation of humidity, rainfall and sky condition with jassid population is positive and moderate (0.520, 0.668 & 0.575 respectively), while the relation of jassid population among these factor is significant except temperature. The results indicate that’s the correlation of temperature, humidity, rainfall and weather condition, it is clear that there is positive correlation of thrips population. While among the relation of thrips with different factor there is very weak relation of thrips population with temperature (.103), the relation of humidity, rainfall and sky condition with thrips population is positive and moderate (.515.751& .577 respectively), while the relation thrips population among these factor is significant except temperature. The results indicate that’s correlation of temperature, humidity, rainfall and weather condition, it is clear that there is positive correlation of Whitefly population. While among the relation of Whitefly with different factors there is very moderate relation of Whitefly population with temperature (.076), the relation of humidity, rainfall and sky condition with Whitefly population is negative and moderate (-.051.-.368 & -.559 respectively), while the relation Whitefly population among these factor is significant except temperature.

Insect Abundance in Soils Contaminated with Palm Oil Mill and Spent Engine Oil Effluents and Their Relationship to Ambient Microclimate

“…In contrast, the mean abundance of insects showed a negative association with mean relative humidity. This suggests that insect abundance decreased as relative humidity increased, opposing the positive relationship observed with temperature [21]. The observed negative correlation between insect abundance and relative humidity is in agreement with findings from a related study on insect responses to varying humidity levels [28].…”

“…Public health is another critical dimension driving the motivation for this study. Insects, particularly those that serve as vectors for diseases, are sensitive to climatic conditions [20,21]. Abakaliki, like many tropical regions, faces health challenges associated with insect-borne diseases such as malaria and dengue fever.…”

Bionomics and Damage Estimation of Dolichothrips indicus (Hood, 1919) (Thysanoptera: Phlaeothripidae) in a New Host in Tamil Nadu, India

“…In distribution mapping based on the population density, no specific pattern of distribution of D. indicus were seen in different agro-climatic zones of Tamil Nadu instead when different weather parameters such as temperature, humidity, precipitation and windspeed were measured, relative humidity was found weakly but positively correlated with D. indicus population. Not for the first time, the study of mango thrips [34], the investigation [35] on thrips also revealed the positive correlation of thrips population with humidity. Therefore, no wonder why highly humid nursery mother bed of IFGTB recorded maximum population compared to open nursery bed.…”

Parasitism of the whitefly Bemisia tabaci by aphelinid parasitoids on cassava across five agro-ecological zones of Cameroon

“…In general, B. tabaci populations are favored by elevated temperatures and moderate rainfall (Sseruwagi et al, 2004). Similarly, high rainfall amounts can also cause high mortality of whiteflies and other insect and mite pestslargely through a washing-away effect (Leite et al, 2005;Katono et al, 2021;Amjad-Bashir et al, 2022;Zsögön et al, 2022) which in turn reduces pest and natural enemy. We observed a strong positive relationship between B. tabaci nymph abundance and parasitism rate by E. lutea in all the AEZs, similar to the findings of Kalyebi et al (2021) in Burkina Faso, Benin, and Togo, which all together support the assumption that the action of parasitoids on B. tabaci is density-dependent (Otim et al, 2006(Otim et al, , 2018.…”