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Herbicide seed dressing of corn as an appropriate treatment for Striga control while allowing intercropping

By: Kanampiu, F.K.
Contributor(s): Friesen, D.K [coaut.] | Gressel, J [coaut.] | Jewell, D.C [coaut.] | Kabambe, V.H [coaut.] | Ransom, J.K [coaut.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: 2000Description: p. 133.Subject(s): Chemical control | Inhibition | Maize | Seed dressing | Seed treatment | Seeds | Weed control | Zea mays AGROVOC In: International Weed Science Congress - IWSC, 3. "Global Weed Problems: Local and Global Solutions for the Beginning of the Century"; Foz do Iguassu, Brazil; 6-11 Jun 2000Summary: Herbicide spray applications control parasitic weeds on crops bearing target site-resistance to the herbicide. Such technologies are inappropriate for subsistence farmers as they are too expensive, do not fully protect the crop from yield losses and preclude intercropping. Seed dressings were tested as appropriate, cost-effective procedures for preventing damage from the parasitic witchweeds Striga hermonthica (Del.) Benth. in Kenya, and S. asiatica in Malawi. Corn (Zea mays L.) genotypes with acetolactate synthase (ALS) target site-resistance allow application of locally high herbicide levels needed. Mg-imazapyr and Na-pyrithiobac had the least phytotoxicity and the longest persistence among ALS inhibitors. Seeds were dressed with herbicide by priming and planting either wet or dry or as seed coatings with polyvinylpyrillidone (PVP) or in insecticide+fungicide dust. Intercropping with beans (Phaseolus vulgaris L.) and cowpeas (Vigna ungiculata L.) was done at intervals from 0 to 30 cm from corn hills. There was hardly any Striga emergence for three months after planting primed PH hybrid 3245-IR corn with any seed dressing containing at least on 30 g a.e. Mg-imazapyr ha-1 or 21g a.e. pyrithiobac. Few Striga that flowered on seed-dressed corn formed no seed by harvest. Striga was nearly suppressed by >30-g a.e. Mg-imazapyr ha-1 in dust or PVP coating. Herbicides were safe to herbicide susceptible intercrops planted at least 15-cm from treated corn hills, but were sometimes phytotoxic to the legume at shorter distances. Seed dressing with both Mg-imazapyr and Na-pyrithiobac coupled with pulling rare Striga escapes can reduce damage and deplete the Striga seed bank. This technology has potential to reduce Striga problem on small-scale farms in Africa where intercropping is also widely practiced. This technology may have value in developed countries to provide an early season weed-free zone around the crop seed and replace pre-emergence spraying with their concomitant monetary and environmental costs
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Book CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

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Abstract only

Herbicide spray applications control parasitic weeds on crops bearing target site-resistance to the herbicide. Such technologies are inappropriate for subsistence farmers as they are too expensive, do not fully protect the crop from yield losses and preclude intercropping. Seed dressings were tested as appropriate, cost-effective procedures for preventing damage from the parasitic witchweeds Striga hermonthica (Del.) Benth. in Kenya, and S. asiatica in Malawi. Corn (Zea mays L.) genotypes with acetolactate synthase (ALS) target site-resistance allow application of locally high herbicide levels needed. Mg-imazapyr and Na-pyrithiobac had the least phytotoxicity and the longest persistence among ALS inhibitors. Seeds were dressed with herbicide by priming and planting either wet or dry or as seed coatings with polyvinylpyrillidone (PVP) or in insecticide+fungicide dust. Intercropping with beans (Phaseolus vulgaris L.) and cowpeas (Vigna ungiculata L.) was done at intervals from 0 to 30 cm from corn hills. There was hardly any Striga emergence for three months after planting primed PH hybrid 3245-IR corn with any seed dressing containing at least on 30 g a.e. Mg-imazapyr ha-1 or 21g a.e. pyrithiobac. Few Striga that flowered on seed-dressed corn formed no seed by harvest. Striga was nearly suppressed by >30-g a.e. Mg-imazapyr ha-1 in dust or PVP coating. Herbicides were safe to herbicide susceptible intercrops planted at least 15-cm from treated corn hills, but were sometimes phytotoxic to the legume at shorter distances. Seed dressing with both Mg-imazapyr and Na-pyrithiobac coupled with pulling rare Striga escapes can reduce damage and deplete the Striga seed bank. This technology has potential to reduce Striga problem on small-scale farms in Africa where intercropping is also widely practiced. This technology may have value in developed countries to provide an early season weed-free zone around the crop seed and replace pre-emergence spraying with their concomitant monetary and environmental costs

Conservation Agriculture Program|Global Maize Program

English

EE

CFDE01|INT2340

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