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Influence of humidity and water availability on the survival of amblyseius idaeus and amblyseius anonymus acarina phytoseiidae



Influence of humidity and water availability on the survival of amblyseius idaeus and amblyseius anonymus acarina phytoseiidae



Experimental & Applied Acarology 4(1): 27-40



Amblyseius idaeus (Denmark and Muma) and A. anonymus Chant and Baker are morphologically very similar species of phytoseiids inhabiting areas in South America that have very different levels of humidity. Above 60% RH, nearly all eggs of both species hatch successfully, but below 60% RH the egg hatching rate of A. anonymus is very poor, where eggs of A. idaeus hatch at humidities as low as 30% RH. The mobile stages of A. idaeus are better able to survive in absence of food and water than those of A. anonymus. Water availability promotes survival of both species, but its effect on A. idaeus exceeds that on A. anonymus. These differences in low-humidity tolerance and survival ability are consistent with the cliamtic origin of these phytoseiid species; Amblyseius idaeus has been reported from very dry and humid areas, and A. anonymus from humid areas only. In comparison with other phytoseiid species, the eggs of A. idaeus have the highest tolerance to low humidities reported to date, and, among the phytoseiids that are shown to be capable of controlling Tetranychus spp., this tolerance appears to be exceptionally high. The impact of this result on the scope of biological control of Tetranychus spp. is discussed.

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