Effect of treated sewage on egg hatch and infectivity of Tylenchulus semipenetrans

F. A. Al-Yahya, A. S. Al-Hazmi, M. A. El-Saedy


When eggs of Tylenchulus semipenetrans were incubated in sewage, stored, autoclaved or boiled-condensed sewage water, egg hatch was suppressed. Number of juveniles that hatched at 2,9 or 15 days incubation were not significantly different among all treatments. After 15 days incubation (end of the test), the cumulative (total) numbers of hatched juveniles were significantly less in all sewage water treatments than in distilled or tap water. Over 50% of the juveniles that hatched after 2 weeks incubation in sewage water treatments were immobile. Percent infectivity of juveniles hatched after one week was significantly higher than those hatched after 2 weeks. No significant differences in infectivity were found among all treatments at one or two weeks.

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