Phytocidal effects of some azole derivatives | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 19, Issue 1, 2011, Pages 15-37 PDF (6.95 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2011.460822 | ||
| Author | ||
| Ahmed S. AbdeI-Aty* | ||
| Department of Pesticide Chemistry and Technology. Faculty of Agriculture. 21 54-6 El-Shatby, Alexandria University. Alexandria. Egypt. | ||
| Abstract | ||
| One. two and three nitrogen atoms containing five-memberred heterocyclic derivatives were tested for their phytocidal effects against seed gennination, seedling root and shoot systems growth of monocotyledonous (Trüicum aestivum L.) and dicotyledonous (Cucurbita pepo) plants. Six benzotriazole, six indole and four pyrazole derivatives were used. Phytocidal effects of the tested compounds appeared as a function of chemical structure. Structure activity relationships were illustrated using different concentrations of the tested derivatives. All of the tested compounds affected the seedling growth more than germination process when treated as pre-emergents. Some stunning effects on wheat primary root and malformations in squash roots were noticed. Substitution with 5,6-dichloro-moiety in 5,6-dichlorobenzotriazole (3) highly increased the phytotoxicity against both seed germination and seedling growth with EC50 values equaled 10.5 and 5.0 gg/ml, respectively. The caused strong inhibition of squash root and shoot systems with (8.6 and 16.8 ug/ml), while those of wheat seedlings (3.4 and 12.4 μg/ml) exceeding that of the standard herbicide. Some other tested derivatives were more potent than the standard herbicide in their effects. 3-Methyl-l (2,4-dinitrophenyl) pyrazol-5-one (17) showed the highest of pyrazole derivative for squash seedlings with EC50 values of 47.2 and 77.] gg/ml, respectively. Both compounds 3 and 17 inhibited both fresh and dry weights of wheat seedlings as concentration increased with reduction percentages reached 94.2%. They affected the sugars contents as a function of concentration and time after treatment. The most active concentration was 100 ug/ml in reducing chlorophyll a and b as well as soluble phenolic compounds. | ||
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