Show natural acid may be used to protect plants london arsenic lead copper and other mineral poisons now used to protect P plants lants against fungus ae ac berfal and insect enemies may find practicable and harnice harmless s replacement in an a acid ead naturally formed by living plants suggests maurice comisarow Cop isarow manchester biologist 04 the substance Is known as malcic acid experiments have shown th that a t it exercises an inhibitory effect on the growth of microorganisms micro organ organisms iams isms ol of decay and mr comisarow Cop isarow suggests that its effect may extend also to viruses hidden in dormant seeds and to insects in sarly early stages of development elop ment tills this same natural inhibitor hi ho he adds Is probably transformed into the natural accelerator of fruit ripening athylene by a chemical change involving the liberation of carbon dioxide mr M r comisarow Cop isarow suggests suggest that thai malcic acid may m be applied p as a spray in some sul suitable table ric neutral atral olly oily medium unlike the tha mineral pol sons commonly used for plant protection tec tee lection tion acid can be eaten by human beings beinas without harm harin I 1 I 1 I 1 I 1 |