Reproductive performance of spiralling whitefly on guava and impact of weather parameters on its immature stages

I Hossain,Mmh Khan,Smh Jahan

doi:10.3329/sja.v15i2.35165

Abstract

The study was conducted to know the reproductive performance of spiralling whitefly on guava. Number of colony, eggs, 1st instar, 2nd instar, 3rd instar and 4th instar nymphs per five leaves ranged from 6 to 15, 8 to 32, 0 to 44, 0 to 22, 0 to 45 and 0 to 28, respectively. Maximum number of adults and nymphs were found in the month of January. Highest longevity of Aleurodicus dispersus (21.5 days) was recorded in adult while the lowest was in 2nd instar nymph (6.4 days). The number of colony/leaf and number of 3rd and 4th instar nymphs of A. dispersus had significant positive correlation with minimum and maximum temperature while non-significant positive correlation is observed between the number of egg/colony, the number 1st and 2nd instar nymphs with minimum and maximum temperature. A. dispersus showed nonsignificant positive correlation with minimum and maximum relative humidity regarding number of colony/leaf, 2nd instar nymph while nonsignificant negative correlation with 4th instar nymph.SAARC J. Agri., 15(2): 207-214 (2017)

Highlights

Guava is grown in all the districts of Bangladesh and in many other Asian countries.The major areas of guava cultivation are the Gazipur, Barisal and Jessore districts of Bangladesh where successful production is achieved
Spiralling whitefly, Aleurodicus dispersus Russell is a highly polyphagous insect species of tropical origin (Martin, 1987) and is reported to infest 99 host plants including fruit trees, vegetable crops, ornamentals, shade and forest trees (Aiswariaya et al, 2007). This insect has introduced in Bangladesh due to poor quarantine system and has become a Corresponding author e-mail: mohasin1965@pstu.ac.bd
The study was conducted in the homestead area of the Patuakhali Science and Technology University (PSTU) campus and in the entomology laboratory during

Summary

INTRODUCTION

Guava is grown in all the districts of Bangladesh and in many other Asian countries. The major areas of guava cultivation are the Gazipur, Barisal and Jessore districts of Bangladesh where successful production is achieved. Spiralling whitefly, Aleurodicus dispersus Russell is a highly polyphagous insect species of tropical origin (Martin, 1987) and is reported to infest 99 host plants including fruit trees, vegetable crops, ornamentals, shade and forest trees (Aiswariaya et al, 2007) This insect has introduced in Bangladesh due to poor quarantine system and has become a. Aishwariya et al (2007) reported that the egg density of spiralling whitefly peaked during April, May, August and November months They observed that the incidence of all the three stages of Aleurodicus dispersus had significant positive correlation with maximum temperature and non-significant positive correlation with minimum temperature, non-significant negative correlation with morning and afternoon relative humidities. Considering above facts the present study was undertaken to know the reproductive performance of spiralling whitefly on guava and to know the impact of weather parameters on immature stages of whiteflies

MATERIALS AND METHODS

RESULTS AND DISCUSSION

CONCLUSION