Download Vegetable Crop Pests by Roderick G. McKinlay (eds.) PDF

By Roderick G. McKinlay (eds.)

ISBN-10: 1349099244

ISBN-13: 9781349099245

ISBN-10: 1349099260

ISBN-13: 9781349099269

ISBN-10: 2752752792

ISBN-13: 9782752752796

This authoritative multi-author reference covers the pests of all significant vegetable plants grown open air in temperate latitudes. info are given at the geographical distribution, description, life-cycle, harm and keep watch over of every pest. Emphasis is given to non-chemical equipment of pest management.

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Extra resources for Vegetable Crop Pests

Sample text

Egg hatch occurs 3-4 days after laying. Newly hatched caterpillars are light green in colour and about 1 mm in length, with relatively large heads. They undergo five or six moults over a 15-25 day period, depending on temperature, and reach up to 32 mm in length before burrowing into the soil and pupating in pupal cells. Pupation lasts six or seven days. One generation can be produced in 21-24 days, and as many as eight generations per year occur regularly in Africa and Israel (Hill, 1987). Plant Damage Despite its name, the beet armyworm is a general herbivore, causing damage to a wide variety of crops such as sugar beet, alfalfa, cotton, upland rice, asparagus, tobacco, groundnuts, tomatoes, cabbages, potatoes, strawberries and many flowers.

More practicable action guidelines based on the relationship between seasonal trap collections of adult T. myopaeformis and subsequent crop yield losses caused by larvae have been developed by Bechinski eta/. (1989) in Idaho, USA; a cumulative catch of 34 flies per trap from the beginning of the growing season was adopted as the damage threshold, above which detectable root yield losses occurred; a minimum of 3 traps per field was recommended. Insecticides should be applied within 10 days of the damage threshold fly capture.

The controlled environment of glasshouses is favourable not only for pest development, but also for natural enemies. In Europe several glasshouse crop pests are controlled by parasitoids and predators (Hussey, 1985; Gould, 1987). As the degree of control achieved by a natural enemy is influenced by environmental factors, the level of crop damage caused by a target insect pest may well become unacceptable before control is effective. This problem has been recognised and 'complete control' may include the application of insecticides as necessary.

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Vegetable Crop Pests by Roderick G. McKinlay (eds.)


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