. Bulletin. Agriculture; Agriculture -- Arizona. 608 Thirty-second Annual Report the attack of Aspergillus, Penicillium and other more or less saprophytic organisms. Sterigmatocystis has appeared in a very few cultures. Inoculations which will determine the na- ture of the bacterium are under way. Histological studies explain the symptoms observed in con- nection with the date-rot disease. Cells at and near the surface of an attacked spot develop a brown pigment. In the meantime, the parasitic hyphae advance through and between the cells, branching freely and becoming swollen where they lie in
. Bulletin. Agriculture; Agriculture -- Arizona. 608 Thirty-second Annual Report the attack of Aspergillus, Penicillium and other more or less saprophytic organisms. Sterigmatocystis has appeared in a very few cultures. Inoculations which will determine the na- ture of the bacterium are under way. Histological studies explain the symptoms observed in con- nection with the date-rot disease. Cells at and near the surface of an attacked spot develop a brown pigment. In the meantime, the parasitic hyphae advance through and between the cells, branching freely and becoming swollen where they lie in the protoplasmic contents of the cells which they soon destroy. The advance toward the center of the fruit is checked for a time when the tannin layer of the date fruit is reached, but the hyphae now spread more rapidly parallel with the surface of the fruit, entirely destroying the parenchymatous tissue and leaving a cavity under the cuticle and epiderm which fills with air and results in the blistered appearance. By the time the tannin layer is penetrated the blister is usually very large. As previously stated, several infected spots may coalesce to form one large spot. Lateral growth of the hyphae just beneath the surface in some cases is rapid, resulting in an extensive brown- ing of the fruit before blisters appear. After a blister has. w. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of Arizona. Agricultural Experiment Station. Tucson : Agricultural Experiment Station, University of Arizona
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