Wallace A R

An English naturalist who formulated the theory of evolution independently of Darwin. He lived 1823-1913. Walnut

See: Juglans regia. Wasp

Although the common wasp is much disliked, because of its propensity to sting, many wasps are hyper-parasites of crop pests and they make a significant contribution to biological control. Water-borne parasites

Any parasite that is disseminated in water. Relatively few crop parasites are water-borne, and those are mainly bacterial. Watercress

See: Rorippa nasturtium-aquaticum. Watermelon

See: Citrullus lanatus.

Growing Soilless

Growing Soilless

This is an easy-to-follow, step-by-step guide to growing organic, healthy vegetable, herbs and house plants without soil. Clearly illustrated with black and white line drawings, the book covers every aspect of home hydroponic gardening.

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