Abstract
Results of laboratory tests in Southern Rhodesia indicate that Colletotrichum tabacum, Böning, the causal organism of tobacco anthracnose, could survive in dry soil for 13–17 weeks and therefore might survive from one season to the next in dry soil in the absence of tobacco‐plant residue. The most favourable conditions for survival arose when soils of high organic content dried out fairly soon after being infected; soils which remained moist were the least favourable.Chemical control of soil infection with methyl bromide gas at 1 lb./100 sq.ft. was effective and not phytotoxic. Of the wettable powders used as soil disinfectants, thiram was more effective than zineb or maneb, but all were phytotoxic at certain concentrations. Phytotoxicity to tobacco, which took the form of stunting and poor root growth, varied with different commercial preparations of thiram and zineb.
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