The tolerance of three Steinernematid nematodes to desiccation and the effects of several types of additives on their mobility

Cleary, L. Basil (1991) The tolerance of three Steinernematid nematodes to desiccation and the effects of several types of additives on their mobility. Masters thesis, Memorial University of Newfoundland.

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Abstract

This was a two-part study. In the first part, differences in the ability of three Steinernematid nematodes to remain mobile at various saturation deficit levels were investigated. A TI₅₀ value (time required for 50% of the nematodes within a sample to reach immobility) was obtained for each saturation level and each species. In the second part, the potential of 11 types of additives to enhance nematode mobility (increase the TI₅₀ value) at various saturation deficit levels was evaluated. -- Results indicated that each species had significantly different TI₅₀ values for each saturation level. Steinernema feltiae (All strain), Steinernema sp. Nfld. strain No. 1 (L1C strain), and Steinernema bibionis had the highest, medium and lowest values, respectively. The additives tested separated into groups based on their TI₅₀ values. The best group with the highest TI₅₀ values consisted of base, heavy and 2251 additives. The second group, klearol, pyronyl and Exxon, and the third group, soybean, savol, cottonseed, sunspray and citrus, had the median and lowest TI₅₀ values, respectively. The additives of the first group possessed the lowest relative viscosity values, while those of the second and third groups possessed the median and highest viscosity values, respectively.

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