Important Insecticides: Directions for Their Preparation and Use (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Important Insecticides: Directions for Their Preparation and Use

For the intelligent and practical employment of insecticides it is necessary to comprehend the nature and method of injury commonly due to insects. Omitting for the present purpose the exceptional forms of injury Which necessitate peculiar methods of treatment, the great mass of the harm to growing plants from the attacks of insects falls under two principal heads based on distinct principles of food economy, Viz, Whether the insect is a biting (mandibulate) or a suck ing (haustellate) species. Each group involves a special system of treatment.

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