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[9000700.] رقم البحث : 9000700 - |
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Response Of Three Weed Species To Herbazed And Gramoxone Alone And In Mixtures In Valencia / |
| تخصص البحث : General |
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Agricultural Research Journal Suez Canal University / |
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Rodaina A. Hassan |
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Ibrahim H. H. Ali |
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Herbicides, herbazed, gramoxone, Valencia orange, Egypt |
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In Egypt, citrus is infested with different species of annual weeds such as jungle rice (Echinochloa
colonum L. Link), green foxtail (Setaria viridis L. Beauv.) and black nightshade (Solanum nigrum). The
present study was designed to determine the LC
25, LC50 and LC
90 of herbazed and gramoxone on the three
weed species. Also, as measured by the reduction in the fresh, dry weights and length of weeds 7, 42 and
84 days post-treatment with herbicides which tested alone and in mixture during 2000 and 2001 seasons.
The LC
90 values of herbazed and gramoxone were 114 and 103.1 g a.i./f. for E. colonum, 190.5 and 125.2
g a.i./f. for S. viridis and 154 and 165.0 g a.i./f. for S. nigrum. The LC 50 values of the same herbicides
were 62 and 58.4 g a.i./f. for E. colonum, 104.3 and 67.7 g a.i./f. for S. viridis and 83 and 90.4 g a.i./f. for
S. nigrum, respectively and LC
25 values were 31 and 29.9 g a.i./f. for E. colonum, 52 and 33.6 g a.i./f. for
S. viridis and 42 and 46.2 g a.i./f. for S. nigrum of herbazed and gramoxone. The results showed that
herbazed and gramoxone at the three rates caused significant effects on the tested weeds. The
combination of the two herbicides gave excellent control of weeds compared with the single compound.
The mixture of herbazed and gramoxone at the rates of LC
50 and LC
90 gave the best result 84 days after
application, when the highest effect on fresh and dry weight of weeds in two seasons was recorded. All
herbicides treatments demonstrated better control of S. nigrum than S. viridis and E. colonum.
Insignificant effects were observed on fruit weight, juice fruit and vitamin C in citrus fruits after
application of herbicides in both seasons. |
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