RELATIONS BETWEEN TYPHLODROMUS CAUDIGLANS SCHUSTER (ACARINA: PHYTOSEIIDAE) AND PHYTOPHAGOUS MITES IN ONTARIO PEACH ORCHARDS

摘要: In peach orchards undisturbed by pesticides and where phytophagous mites were at endemic densities, spring populations of Typhlodromus caudiglans small remained so during early summer until mites, especially Aculus cornutus , began to increase. T . reached maximal densities in September. such appears be an important factor maintaining Panonychus ulmi low density levels. On trees DDT applied the previous year had caused P build up which could repopulated from neighbouring trees, predator increased very rapidly but appeared reach upper limit fixed intrinsic factors, possibly cannibalism. Under these conditions not bring one season, though it slow mite’s rate increase reduce its seasonal density.