Present work was conducted for studying biological control of the termite psammotermes hypostoma (sand termite) This study includes the following results: Toxicity results of Bacillus thuringiensis var. kurstaki against the termite psammotermes hypostoma revealed higher mortality values at the highest concentrations used 6gm/L, while the lowest concentrations gave moderate mortality values 53%. Use of Beauveria bassiana, indicated negligible mortality values ranged between from (3.6-16.2%) at the three tested concentration. Application of nematodes (Steinernema carpocapsae) against subterranean termites, mortality has begun 24 hours post-treatment. The first concentration represented (40.2%) mortality, the second concentration represented (78.2%), and the highest used concentration gave complete mortality values (100%). The LT 50 for Dipel 2X was 2.6, 3.01 and 4.9 days and 2.2, 3.2 and 7.3 days for Bacillus thuringiensis approximately.
Study of sand termite, P. hypostoma (Desn.), throughout two successive years in 1995 and 1996, clarified that, the termite individuals were abundant during winter and autumn seasons. The workers, first and second nymphs and soldiers were abundant in the winter and reduced during summer season. On the other hand, swarming of winged castes (alates) was occurred during autumn and summer months. The population of workers represented the highest percentages from the total numbers of gallery, followed by soldiers, nymphs and alates. In summer 1995 and 1996, the attraction rate of traps in the tested area (surface activity) was higher during autumn and winter and lower in summer, while the surface activity (food consumption and soil translocated without insects) was higher during summer and autumn, while was lower during winter season throughout 1995 and 1996. Also the highest number of caughted traps was recorded during winter and the lowest one occurred during summer. Food consumption by termites was higher during spring and summer, while it was lower during winter. Soil translocation (construction) showed also the same trend.
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