By Kent H. McKnight, Vera B. McKnight, Roger Tory Peterson
Approximately all nature-oriented humans profess a love affair with the vegetation, yet just a restricted quantity admit to the same ardour for mushrooms, except as a desk delicacy. a few humans might brush aside them as «toadstools,» to be ranked with spiders, snakes, bats, and different issues that experience develop into symbolic of the darkish part of lifestyles.
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Additional info for A Field Guide to Mushrooms: North America (Peterson Field Guide)
It occurs most frequently on Epiphyllum and Opuntia and shows as irregular rusty or corky spots which develop into sunken patches as the tissues beneath die. Where the trouble is very unsightly propagate from the affected plant and ensure that new plants are given correct cultural treatment and are not exposed to too much light. Leaves blotched Chrysanthemum eelworm and fern eelworm (Aphelenchoides ritzemabosi and A. iragariae) are microscopic worm-like animals that live inside leaves. Many different plants may be infected, although in greenhouses the main hosts are those indicated by the pests' common names.
Apply to the leaves of the plant until run-off, using a watering can fitted w i t h a fine rose. Soil and mixes 1 Plants growing under glass, whether in a c o n tainer or in a bed in a greenhouse or frame, have access to lower levels of soil nutrients than do plants in open ground. Therefore soil in beds needs to be enriched, and special soils or mixes are required for pots or containers. An understanding of the nutrients necessary to plant growth is important in order to judge what needs to be added to basic soils and growing mixes to ensure health (see page 45).
While biological control avoids chemical build-up on plants, a point especially to be borne in mind with food crops, it is a less certain and more complicated method of pest control than the use of chemicals. The use of predators has to be carefully timed. This may involve investigating sources of supply well before the trouble is likely to arise and taking swift action once the pests are noticed. Pests and diseases 1 Introduction This section is concerned with the various pests, diseases and disorders that may affect plants grown under glass.