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The development of spider mite populations (T. urticae and T. cinnabarinus) as well as plant injuries on different croton cultivars were studied. Observations were conducted in commercial and experimental glasshouse conditions. The highest spider mile populations were noticed on cultivars Norma and Petra, the lowest on Golden Sun. Tetranychus urticae was the dominant species in commercial glasshouses. Croton cv. Norma was severely injured by T. urticae. The leaf damage index (LDI) for this cultivar was almost 4 after sixteen weeks of mile infestation.
Crop protection at growning under covers is very technically advanced, of ten with computerized environment control, fertigation systems and release of biological control agents. Substantial expertise is required first to finding information, understanding what it means, and then to integrating this information into farmer's own commercial operation and that is where the DSS are useful. The paper presents existing computer supporting systems for various production and protection programmes for horticultural crops grown under protection. The first decision expert system for integrated production and protection of tomato grown under covers developed by the inter-institutional and inter-disciplinary team of researchers in Poland was also included.
Paper reviews existing computer aided systems developed for various plant protection programmes for horticultural crops grown under open field conditions. Simple models and linear programming are applied to develop the support systems for the Supervised Pest Management (Intelligent Pesticide Management). To develop computer programmes for Ecologically Based Pest Management extended application of simulation modelling and dynamic programming is of ten required. Available expert systems used in various countries for plant protection decisions in horticultural crops are presented. The user's friendliness and value of internet information sources on plant protection for research workers, extension service staff and the growers, are compared to other sources of information on plant protection in Poland.
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