| Autor: |
Yantai Gan, I., Puhai Liu, I., McDonald, Calvin |
| Předmět: |
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| Zdroj: |
Crop Science; Nov/Dec2003, Vol. 43 Issue 6, p2291-2294, 4p, 2 Charts |
| Abstrakt: |
Severity of Ascochyta blight (Ab) [caused by Ascochyta rabiei (Pass.) Labrousse] in chickpea (Cicer arietinum L.) can be reduced by use of cultivars with a desirable plant architecture. Field experiments were conducted in semiarid southwestern Saskatchewan in 2001 and 2002 to determine the relationship between Ab severity and leaf shape in chickpea. Seed was treated with thiabendazole [2-(thiazol4-yl)benzimidazole], and metalaxyl [N-(2,6-dimethylphenyl)-N-(methoxyacetyl)-DL-alanine methyl ester] to reduce seed-borne diseases, and plots were sprayed with chlorothalonil (tetrachloroisophthalonitrile) and azoxystrobin [methyl (E)-2-{2-[6-(2-cyanophenoxy) pyrimidin-4-yloxy]phenyl}-3-methoxyacrylate] to minimize leaf diseases. Chickpea with fern leaves were compared with those with unifoliate leaves for their susceptibility to Ab. No diseases were observed during the seedling stage. As the crop approached preflowering, Ab symptoms became evident and the differences in Ab severity became great between fern- and unifoliate-leafed chickpea. Measured at the bloom stage in 2001, Ab severity was 36% for unifoliate-leafed chickpea and 12% for fern-leafed chickpea. In the cool, moist year of 2002, the disease was severe with the unifoliate-leafed chickpea having an Ab severity of 95%, compared with 35% for the fern-leafed chickpea. The relative rankings of Ab severity between the two leaf types remained the same even when plant population was increased from 21 to 76 plants m[sup -2]. Chickpea producers in the semiarid northern Great Plains should select cultivars with a fern leaf shape to reduce the Ascochyta disease pressure and minimize disease damage to the crop. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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