Effect of the snail parasitic nematode Phasmarhabditis tawfiki Azzam on some snails and insects in different types of soils under the green house conditions [electronic resource].

Includes reference.

The capability of Phasmarhabditis tawfiki Azzam to control the snails Eobania vermiculata (Müller) and Theba pisana (Müller) and the insect larvae of Agrotis ipsilon (Hüfngel) and Spodoptera littoralis (Boisd.) was investigated under greenhouse conditions, using three types of soils (clay, mixture of sand and clay, and sand), using an infective dose of about 200 I.S per snail or larva for four weeks. The mortality rate of Eobania vermiculata (Müller), Theba pisana (Müller), Agrotis ipsilon (Hüf.) and Spodoptera littoralis (Boisd.) exposed to infection with P. tawfiki was 88.94, 83.75, 93.75 and 71.25 %, respectively in the clay soil. In the mixture of sand and clay soil, these rates were 67.5, 72.5, 70 and 60 % ,while in the sand soil they recorded, 53.75, 63.75, 62.5 and 52.5 %, respectively. The highest number of recovered nematodes (14579.09 I.S./snail) was reported for the snail E. vermiculata infected in the clay soil. Reversely, the lowest number(2560 I.S./larva) was associated with larvae S. littoralis in the sandy soil. T. pisana and A. ipsilon recorded 9807.17 I.S./snail and 6803.28 I.S./ larva respectively in the clay soil. Rates of individuals recovered nematodes in the clay soil were 89.94, 85.04, 82.79 and 79.01 % for E. vermiculata, T. pisana, A. ipsilon and S. littoralis, respectively.

Summary in arabic.

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