Mobile pests

Bewick DW, Hill IR, Pluckrose J, Stevens JEB, Weissler MS (1986) The role of laboratory and field studies, using radiolabelled materials, in the investigation of the degradation and mobility of tefluthrin in soil. Proceedings, BCPC Conference - Pest and Diseases, British Crop Protection Council, Brighton, 4B-2, pp 459-468... 

House WA, Long JLA, Rae JE, Parker A, Orr DR (2000) Occurrence and mobility of the insecticide permethrin in rivers in the southern Humber catchment, UK. Pest Manag Sci 56 597-606... 

Tn applying pesticide sprays, the first problem is that of distributing a small quantity of active material over a large target area. The uniformity and extent of the distribution required depend on the type of pest to be controlled and the mode of action of the toxicant a patchy distribution may be satisfactory to control mobile insects or to apply systemic pesticides to foliage, whereas for static pests and contact pesticides, a more uniform spray deposit may be required. The degree of distribution attained depends on ... 

Life Cycle Most species have a mobile larval stage that moves through the soil or on a film of water to infect the host plant or insect larvae molt several times to reach the adult stage adults lay eggs in masses. Life cycle for many pest species takes 3-4 weeks. 

For existing resistance problems, no individual grower, researcher, or company can design and implement effective solutions in isolation. The pests are too mobile and resilient, and the chemical tools available are too few in number and too limited in modes of action for anything but a coordinated effort to succeed. 

It is also active against hoppers in rice and controls the mobile stage of whiteflies nymphs (LI) and adults in various crops. Table 30.1.4 documents the currently recommended pest uses after foliar spray and seedling box application. The recommended rates of active ingredient (a.i.) vary according to crops and pests. In most cases 100-300 g-a.i. ha , 10-30 g-a.i. hl or 1-2 g-a.i. per seedling box are sufficient to fully control the target pests [1, 3, 4, 24—34]. 

Trap cropping involves growing a susceptible plant species before the main crop or growing it in strips around a crop. This sacrifice plant/crop is used to attract mobile predators before they attack the crop these pests can then be killed so that the pest life-cycle is not completed. 

Regular soil sampling for cysts should be undertaken to aid the management and control of this major pest. Nematodes are not very mobile, aim to restrict movement of contaminated soil. Check NIAB/TAG guide to varieties of potatoes for susceptibUily ratings. 

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