Co-Authors:
Glazer, I., Department of Nematology, ARO, The Volcani Center, 50250 Bet Dagan, Israel
Abstract:
Factors affecting the persistence and activity of the infective juveniles (IJs) of the nematode Steinernema carpocapsae ‘ Mexican ‘ strain on the foliage of bean plants were determined at 45, 60 and 80% relative humidity (RH). The rate of nematode mortality was related to the RH. A gradual reduction in nematode survival was recorded during a 6 h exposure period at 80% and 60% RH, whereas at 45% RH high mortality was observed within 2 h. Addition of the antidesiccant Folicote ‘ (6% w/w) to the nematode suspension was most effective in ensuring IJ survival at 60% RH, resulting in 38—60% increase in viability during 6 h of exposure. At 80% RH Folicote ‘ treatment resulted in only 10—20% increase in IJs viability, as compared with non-treated IJs. At 45% RH, Folicote’ treatment did not significantly increase IJ survival (P>0.05). Survival of the IJs on tomato and soybean leaves was 30–35 % higher than of those recovered from leaves of cotton, pepper and bean as well as from filter paper. At 60% RH, IJ movement ceased within 45 — 60 min of exposure and the nematode body shrank. However, nematode pathogenicity remained almost unaltered up to 4 h of exposure, resulting in 75% mortality of larvae of the Egyptian cotton worm Spodoptera littoralis. A drastic reduction in the nematodes efficacy was recorded when the insects were introduced 6 and 8 h after nematode application. © 1992, Taylor & Francis Group, LLC. All rights reserved.
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ניגודיות עדינה
מונוכרום
הדגשת קישורים
חסימת אנימציה
פונט קריא
סגור
איפוס הגדרות נגישות
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