Biological Control

If you order your custom term paper from our custom writing service you will receive a perfectly written assignment on Biological Control. What we need from you is to provide us with your detailed paper instructions for our experienced writers to follow all of your specific writing requirements. Specify your order details, state the exact number of pages required and our custom writing professionals will deliver the best quality Biological Control paper right on time. Our staff of freelance writers includes over 120 experts proficient in Biological Control, therefore you can rest assured that your assignment will be handled by only top rated specialists. Order your Biological Control paper at affordable prices with cheap essay writing service! Gorse is a dense, spiny, dull greyish-green shrub that typically grows to about three metres in the Pacific Northwest. It has small leaves that are generally shorter than its conspicuous spines. From early spring, yellow pea-like flowers develop in clusters on the ends of its branches becoming hairy black seed pods by late summer. A typical shrub produces about 8000 seeds annually. Gorse seed can lay dormant in the soil for up to 40 years and still germinate. Soil disturbance during road building and tree harvesting present opportunities for the successful germination of seed.Gorse originates in western Europe. It was introduced into New Zealand by settlers and sold by seed merchants and nurseries for private cultivation until the 180s. Since then it has spread to cover more than three per cent of the total land area in New Zealand, including significant agricultural areas and forest plantations. Gorse is probably New Zealand's commonest and most costly weed. It is rarely economical to control gorse on grazing land by using conventional means and much marginal pasture land is reverting to gorse cover.

Control of gorse using biological control agents began in 18 with six agents having been released so far. This technique is unlikely to provide the type of control achieved with herbicides. Rather, the aim is to reduce the growth rate, seed production and density of gorse.

Gorse Spider Mites were released into New Zealand in 18. They are tiny red mites that live in colonies, spin webs and feed on gorse foliage. Where many mites have been feeding, the foliage becomes pale yellow or white, and flowers are aborted. research shows that when mites are present in large numbers, they cause considerable reduction in the growth of gorse shoots.

Gorse thrips were released in New Zealand in 18 to complement the activity of other biological control agents. They attack the foliage of gorse by piercing the stem and sucking out the plant cell contents. Gorse damaged by thrips has a mottled blotchy appearance.

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The original strain of gorse spider mite which came from England did not do well in some areas. Five new strains have since been imported from Spain and Portugal. Although the different strains of gorse mites look alike, their responses to environmental conditions are different, which affects the success of populations in different climates. The new strains are expected to perform better in warmer, wetter climates than the original strain.

http//www.maf.govt.nz/MAFnet/schools/activities/gorse/grsmtact.htm

http//www.for.gov.bc.ca/hfp/pubs/interest/gorse/gorse.htm

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