L. Colossus . Leningr . from 1984. — 318 s. , il. Conforms to the program of the course "Signaling and forecast of reproduction of pests and diseases of agricultural plants" and includes the principles of organization of work on diagnostics, forecasting the spread of pests and diseases of agricultural crops and signaling the timing of their control. Methods of mathematical-statistical data processing of pest and disease distribution and control effectiveness, as well as determining the threshold of harmfulness are given . On individual topics in the manual are given laboratory and practical work . For students of the faculties of plant protection .