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  • Author or Editor: J. C. Stutz x
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Abstract

Canopy density over a native stand of Ilex opaca Ait. in Georgetown, Delaware was modified to provide 3 light intensity levels. Berry set was significantly greater in the cleared stand vs. the partial and full canopy plots. Leaf chlorophyll expressed on either an area or weight basis, was significantly less in the cleared stand than the other 2 treatments. Decreased light intensity significantly increased leaf area while decreasing leaf weight. Trees in the cleared stand had a significantly greater increase in trunk diameter and height, but not in width, than did lower light treatments.

Open Access

Abstract

Etridiazole, etridiazole/thiophanate, fenaminosulf, Captan, and pentachloronitrobenzene (PCNB) were tested for prevention of damping-off of guayule (Parthenium argentatum Gray) seedlings in greenhouse tests. Fungicides were incorporated into a magnesium silicate fluid drilling gel containing pregerminated seeds. The seeds were sown into vermiculite and inoculated with Pythium debaryanum or Rhizoctonia solani. Phytotoxic levels of the fungicides were determined. PCNB was very effective in controlling damping-off caused by R. solani. Captan and fenaminosulf provided over 50% protection from damping-off caused by P. debaryanum. Etridiazole and etridiazole/thiophanate controlled preemergence damping-off, but did not control postemergence damping-off caused by P. debaryanum. Chemical name used: 3a,4,7,7atetrahydro-2-[(trichloromethyl)thiol]-1H-isoindole-1,3(2H)-dione (Captan).

Open Access