Cactus asi seran mas hermosos by Franz Becherer

By Franz Becherer

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G. apples in Massachusetts, USA), depending on the target pest. Because spiders lack host specificity, they are not suited for introduction to new regions to control specific pests. NON-INSECT PREDATORS Non-insect predators are found in several groups of invertebrates such as spiders, mites, and snails, and in groups of vertebrates, including birds, mammals, fish, reptiles, and amphibians. 1 Wolf spiders (Lycosidae) do not build webs but rather actively pursue prey. Photograph courtesy of Jack Kelly Clark, University of California IPM Photo Library.

Choosing the sex ratio of offspring Many hymenopteran parasitoids are arrhenotokous, having haplodiploid reproduction. Females of such species can selectively control egg fertilization. 9). This allows parasitoids to put female eggs in the best hosts, reserving male eggs for less-than-optimal hosts. 10). Previously parasitized hosts often receive more male eggs because they provide fewer resources (Waage & Lane 1984). Sex ratios in laboratory colonies can become male-biased due to encounters with too many parasitized or small hosts, lowering colony productivity.

Predaceous insects have winged adults, which are more mobile than nymphs or larvae. Dispersing adult insects often have well developed senses of sight and olfaction that allow females to locate high-density prey patches.

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