Abstract:Five distinct infestations of San José scale (Diaspidiotus perniciosus) were identified on a single vaseshaped 'Red Delicious' apple tree, and a stratified random sampling programme of the population was carried out from September 1969 to September 1970. All live and dead scale insects, except crawlers, were counted fortnightly on samples of bark, fruit and leaves from the trunk, leaders, main branches, twigs, fruit spurs and new shoots within the strata (50 samples/sampling occasion). The strata were below, w… Show more
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