A growth and development simulation medel of plastic-covered tomato, and aforaging structure model of tomato fruitworms, Heiccoerpo armtw (Hubner), have beenestablished based on field experimental data of 1993 and 1994. Net photosynthesis rate, drymatter accumulating of each plant orgen, construction of morphology and product yielding arepredicted. The causes of shedding of the bud, flower and fruit are summed up as physiologicaldrop, bad enviroment conditions and pest damage, and fuly analysed so that they...