By M. J. Jeger (Editor), N. J. Spence (Editor)

In accordance with a equally named assembly in December 1999, equipped via the British Society for Plant Pathology, this booklet considers the biology of interactions among host crops and the pathogens that infect them. this crucial subject has noticeable a few major advances some time past 10 years, in particular in the course of the program of molecular recommendations, that are broadly lined during this e-book.

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1998) Polymorphism of het-genes prevents resource plundering in Neurospora crassa. Mycological Research 102, 1343–1349. , Yang, X. F. (1994) Vegetative incompatibility in Neurospora: its effect on horizontal transfer of mitochondrial plasmids and senescence in natural populations. Current Genetics 26, 113–119. J. (1995) The evolution of polymorphic compatibility molecules. Molecular Biology and Evolution 12, 494–502. O. (1935) The mechanics of sexual reproduction in Neurospora. Mycologia 27, 418–438.

Spence feeding upon the virus source, and their retention in the beetles is for days or weeks. The viruses that are not transmitted by beetles are now known to be subject to specific inactivation by an enzyme (RNase) in the regurgitant fluid produced by the beetle during feeding. Beetle transmission seems to be accompanied by virus introduction into and transport through xylem. The movement of two beetle-transmissible viruses, southern bean mosaic comovirus (SBMV) and bean pod mottle comovirus (BPMV) and two nonbeetle-transmissible viruses cowpea strain of tobacco masaic tobamovirus (CP-TMV) and tobacco ringspot nepovirus (TRSV) into the haemocoel of chrysomelid and coccinellid beetle vectors after ingestion has been studied to understand the mechanisms involved.

G. the root-knot and cyst-forming nematodes). These nematodes are highly adapted to parasitism, having lost the ability to migrate to new food sources, and compensating by increased rates of reproduction. Nematodes recognized as pests of grasses and the situations in which damage may occur were reviewed by Cook and Yeates (1993) and, more recently, by Bernard et al. (1998). Briefly, some nematode populations reach densities such that penetration and feeding activities significantly damage root growth.

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