. Elementary principles of agriculture; a text book for the common schools . 1 ig lUJ ,^pia>iiig. and the deadly hydrocyanic acid gas, used especially for San Jose scale. Where plants are sprayed to prevent fungous diseases, the poison for insects may be applied in the same solution at the same time. There are many kinds of special machines for applying fungicides and insecticides. They are fully described in special books and bulletins. 232. Classification of Insecticides. Substances that are used to poison insects are called insecticides. There

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