BIOLOGICAL STUDIES ON THE PREDACIOUS MITE Procto/ae/aps pygmaeus (ACARI, ASCIDAE) IN RELATION TO THE RELATIVE HUMIDITY

Document Type : Original Article

Authors

1 Pests and Plant Protection Department, National Research Centre (NRC), Dokki, Cairo, Egypt

2 Plant Pathology Department, National Research Centre (NRC), Dokki, Cairo, Egypt

Abstract

The predacious ascid mite, Proctolaelaps pygmaeus (Muller) was reared on
motile stages of the eriophyid grass mite, Aceria dioscoridis (Soliman and Abou-
Awad) and the root-knot nematode, Meloidogyne incognita Chitwood egg-masses.
The rate of development was faster when the predator fed on A. dioscoridis than the
root-knot nematode. The results indicated that the eriophyld grass mite A. dioscoridis
was the most favorable prey for the predator egg production; the average number was
3.41 eggs/female/day. In contrast the root-knot nematode M. incognita gave the
lowest reproduction rate 0.53 eggs/female/day. Data showed that no significant
difference in the developmental time at relative humidity ranged between 30 and 90%,
while 60% R.H. increased both food consumptionlfemale/10 days (88.89 prey/day)
and the female fecundity (1.98 eggslfemale/day) when the ascid mite, P. pygmaeus
fed on A. dioscoridis.