Volume 13, Horticultural Reviews by Jules Janick

By Jules Janick

Horticultural reports current state of the art studies on issues in horticultural sciences. The emphasis is on utilized subject matters together with the construction of culmination, greens, nut plants, and decorative crops of business value. it's a serial that looks within the kind of one hardbound quantity in line with 12 months.

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Verticillium lecanii gave good control of Myzus persicae on chrysan- 28 K. D. SUNDERLAND. R. J. CHAMBERS, N. L. HELYER, AND P. I. SOPP themum and eggplant (Zimmerman 1983), but was less effective against Brachycaudus helichrysi and Macrosiphoniella sanborni (Hall and Burges 1979; Gardner et a1. 1984). The commercial formulation also controlled Aphis gossypii on cucumber (Hall 1982, 1985b). Variations in the degree of control are not related to the relative degree of susceptibility of species, but rather to differences in the aphid's behavior and location on the plants (Hall and Burges 1979).

Two-spotted mites, broad mite (Polyphagotarsonemus latus [Banks}), and pollen were all consumed in the absence of thrips prey (Bonde 1989). Because of this low kill rate compared to other arthropod predators, high predator:prey ratios are required for the mite to make an impact on the thrips population. The increase rate measured in the laboratory is probably not maintained in the greenhouse, and Amblyseius spp. are not necessarily in dYnamic equilibrium with their prey. ) feeding on bran (Ramakers and van Leiburg 1982) allows the liberation of large numbers at affordable prices.

Did not always establish satisfactorily on cucumber, and may need to be supplemented by an application of the fungus Verticillium lecanii. Improved methods of release are needed for Amblyseius spp. At present, the mite is released by tipping the bran in which it is supplied onto the leaves. Good dispersal around the crop is important, but on cucumber leaves bran slides off easily and mites can be lost. "Open rearing units" consisting of small quantities of bran containing storage mites with A. cucumeris can be placed on the rockwool blocks beneath the plants.

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