WITH reference to the advantage of this method described by A. van Itterbeck 1, it may be said 2 that another advantage it has over the capillary stream method lies in the insensitivity of the disc ...

ATTEMPTS at the biological control of soil-borne eelworm pests have usually involved a process of green manuring or the addition of some organic amendment to the soil 1–3. A method has been developed ...