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Virginia Commercial Pesticide Applicators CORE Exam | Questions and 100%Correct Answers | Verified | Latest Update 2024. Explain the difference between key pests, occasional pests and secondary pests - ANSWER Key pests are nearly always present and require regular control. occasional pests are migratory or cyclical and require intermittent control. secondary pests require control only under certain conditions, such as the elimination of a key pest or the absence of a natural host. what sho...