Ecological Studies on Ferrisia virgata CKLL. on Acalypha Shrubs in Dokki, Giza (Homoptera, Pseudococcidae)

Abstract

Population dynamics of Ferrisia virgata on Acalypha macrophylla was studied throughout one year. Three annual generations occurred on early June, early July and early August; increasing gradually in size, respectively.F. rirgura overwinters during January-early June, probably as adult females in the cracks and junctions of trunk and large branches and on the fallen leaves. In the laboratory, females migrate to the soil in winter. The preferable cardinal directions for this pseudococcid are southern east in first generation and southern west in the other two generations. Significantly positive correlation was found between population density and daily minimum and maximum temperatures, but correlation with relative humidity was insignificant.

Population Density of the Striped Mealybug Ferrisia virgata (Ckll.) (Hemiptera: Pseudococcidae) on the Ornamental Corn Shrubs, Dracena fragrans in Relation to Biotic and Abiotic Factors in Al-Zohria Gardens, Cairo, Egypt

“…The mean numbers of insects were 24.7 and 16.6 individuals/ sample in the two successive years, respectively. The result is in agreement with that obtained by Ammar et al (1979) reported that F. virgata had Three generations a year were in early June, early July and early August, and the population size increased with each generation. F. virgata overwintered between January and early June, probably as the adult female, in the cracks and junctions of trunks and large branches and on fallen leaves.…”

“…The summer and winter seasons showed a moderate mean numbers of the insect population (15.8 and 7.6 individuals/ sample) with daily maximum, daily range, daily minimum of temperature and daily mean of relative humidity 34.9, 10.7, 24.2 and 51.1% in summer and 18.7, 9.1, 9.6 and 52.5% in winter, respectively. The data was in agreement with Ammar et al (1979) reported that three distinct generations in density of mealybug F. virgata are observed during the summer and fall seasons and overwintered between January and early June.…”

“…The data were in agreement to Ammar et al,. (1979) they showed that significant positive correlation found between population density of F. virgata and daily maximum and minimum temperatures, but not between population density and relative humidity.…”

POPULATION DENSITY OF SOME INSECTS INFESTING Lantana camera L. SHRUBS AND THEIR PREDATORY INSECTS AT MANSOURA DISTRICT

“…These peaks were recorded in the mid of May, in the first week of July and the end of June 2012.2013, while the third peak were recorded in the mid of September in 2012 and the mid of October in the second year. Ammar et al (1979) found that three annual generations of F. virgata on Acalypha macrophylla in the early of June, July and August.…”

Striped Mealybug Ferrisia virgata Cockerell (Insecta: Hemiptera: Pseudococcidae)­

“…Eggs are deposited on the pad and the first instar nymphs hatch within a few hours (Awadallah et al 1979b). There are three to five generations per year (Ammar et al 1979, Awadallah et al 1979b, Highland 1956).…”