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Sixty-one pesticides were tested in the laboratory against 5 parasitic hyulCnopterans and 6 predatory coccinellids, the data to serve as guides for selecting the best materials for destroying pests without undue harm to natural enemies. Test species were exposed in replicated tests to day-old residues of the pesticides under standardized conditions of dosage, temperature, and humidity. The single dosages applied wcre those most commonly used upon orchard crops, A table presents toxicity levels for each

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