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The influence of spore dose and interrupted wet periods on pear scab infection was studied under controlled conditions by assessing disease development on pear seedlings. Under optimal conditions (20°C and continuous wetness), the severity of leaf scab (lesions/cm2) increased with conidial concentrations ranging from 102 to 105 conidia/mL. Pear seedlings inoculated with conidia were also exposed to...
Hydrated lime, thiram, flusilazole and various alternating combinations of the three materials were compared in spray schedules from green tip until summer at two sites over 3 years to control pear scab caused by Venturia pirina. Six to ten sprays of 2% hydrated lime significantly (P = 0.05) reduced the incidence of fruit scab (by up to 41%) or leaf scab (by up to 83%) when applied to trees in four...
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