Population trends of certain arthropods and some fungal diseases of grapevines in Central Jordan Valley [Lobesia (polychrosis) botrana Schiff; Retithrips syracus Mayet; Empoasca lybica Berg.; Eriophyes vitis Pagenst.; Thrips tabaci Lind.; Aphis sp.; Planococcus vitis N.; Uncinula necator (schw) Burr.]
1990
Haddadin, J.J.Y.
Population trends of arthropod pests, natural enemies, fungal diseases incidence and severity and growth and development of grapevines were studied on Darawishi and Salti cv., 1989/90 seasons. Grape berry moth, thrips, leafhopper, black vine thrips and eriophid mite major peacks of attacking activities, representing two generations in two seasons were discussed. Powdery mildew infected grapevines regularly during both seasons, as Darawishi was more susceptible to the disease than Salti, while bunch rots appeared during maturation and ripening periods, causing insignificant damages. Powdery mildew was considered key pest while Bunch rot a secondary one. Furthermore, temperature and RH influence on population trends of arthropod pests severity and incidence of powdery mildew were observed in relation to moderate and high mean temperatures accompanied by low and moderate RH, respectively. The annual growth and development of grapevines was devided into four periods: bud burs and shoot growth; fruit formation; maturation and ripening; postharvest. Accordingly, as the length of each period was estimated by days, the length of the annual growth and development was 272 and 270 days for Darawishi and Salti, respectively. Two parasites were found to attack the grape berry moth larvae. A braconid parasite Ascogaster quadridentata W. has potential importance, and an ichneumonid sp. was of no significance because of its low numbers. Four predators were found in the vineyard. A phytoseiid mite Euseius scutalis A.H. was the most important one due to its high population and long period of activity. Two green lacewing, the seven spotted lady beetle, mantid sp. and spider were found in small numbers at different periods during the growing season
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