Abuja Journal of Agriculture and Environment (AJAE)

INFLUENCE OF WEATHER FACTORS ON THE POPULATIONS OF DYSDERCUS VOLKERI F. (Hemiptera: PYRRHOCORIDAE) ON COTTON VARIETIES IN ZARIA, KADUNA STATE
Author(s): Musa, N., Onu, I., Bamaiyi, L. J.,Adamu, R. S., and Magaji, B. T.
Volume/Issue: Volume 1 , Issue 2 (2021)

ABSTRACT:

Field trials were carried out in 2019 and 2020 cropping seasons at Samaru, Zaria to study the influence of some weather factors on the populations of D. volkeri using six cotton varieties. The experiment was laid out in Randomized Complete Block Design (RCBD) replicated four times. Insecticides were not applied as the study was done under natural infestation condition. The parameters assessed included nymph and adult populations of D. volkeri, minimum and maximum temperature, rainfall and relative humidity. The results showed peak incidence of D. volkeri nymph and adult populations (36.83 and 34.92) per three plants between September and October, 2019 when temperature and relative humidity were 38 ˚C, 70 % and 31˚C and 81 %,respectively. On the other hand, peak nymph and adult populations (18.88 and 20.75) per three plants between September, and first week of November, 2020 when temperature, relative humidity were 31˚C, 81 %and 35˚C and 23 %, respectively. In 2019, SAMCOT 8 (14.71) and SAMCOT 11 (12.65) varieties had significantly higher (P≤ 0.05) D. volkeri nymph and adult populations compared to other varieties, while in2020 SAMCOT 12 (9.71) and SAMCOT 13 (9.63) recorded significantly higher (P≤ 0.05) D. volkeri nymph and adult populations. There was positive correlation between minimum temperature and number of nymphin 2019 cropping season. While in 2020, D. volkerinymph populations positively correlated with relative humidity, minimum temperature, and evaporation. Similarly, minimum temperature, sunshine hours, soil evaporation, wind speed positively correlated with relative humidity.

KEYWORDS:

Dysdercusvolkeri, Temperature, Relative humidity, Cotton.