. Cottony rot of lemons in California. ili* Fig. 11.—Peziza or spore stage of cottony rot fungus growing under avetch cover crop in orchard soil. even the longest time, 15 minutes, and the greatest strength, y5 percent, wrere not sufficient to kill all the spores treated. It is not strange,therefore, that under the usual commercial conditions, spores of thefungus should occasionally pass through the disinfection, with coppersulphate, without being killed. The chief difficulty in using disinfectants is to find one that willkill the spores without injuring the lemons. Formaldehyde is muchmore ef
. Cottony rot of lemons in California. ili* Fig. 11.—Peziza or spore stage of cottony rot fungus growing under avetch cover crop in orchard soil. even the longest time, 15 minutes, and the greatest strength, y5 percent, wrere not sufficient to kill all the spores treated. It is not strange,therefore, that under the usual commercial conditions, spores of thefungus should occasionally pass through the disinfection, with coppersulphate, without being killed. The chief difficulty in using disinfectants is to find one that willkill the spores without injuring the lemons. Formaldehyde is muchmore efficient as a germicide for cottony rot than copper sulphate, but COTTONY ROT OF LEMONS IN CALIFORNIA 255 its use is not to be encouraged because of its injury to the fruit, fol-lowed by infection with the two species of Penicillium, the green andblue mold. In some of the preliminary work it was shown that by using awash of alcohol preceding that of the copper sulphate, more satis-factory results could be secured in killing the spore
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