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Weed control in fodder crops with monochloroacetate

Proc Natl Weed Control Conf New Zealand 12: 99-105

Weed control in fodder crops with monochloroacetate

In replicated experiments in Horotiu sandy loam, chou moellier (4 true leaves) and swede were resistant to MCA 15 no. in 30 gaL MCA 15 no. severely damaged fodder beet 2-3 in. high (4 leaves) and caused slight retardation but inefficient weed control in beet 6-8 in. (8 leaves). Weeds controlled by MCA 15 no. were Polygonum persicaria 6-8 in., Amaranthus retroflexus 6-8 in. and Spergula arvensis 6 in. (but in South Island 25 no. was unsuccessful) and Solanum nigrum, when very small. MCA 20 no. gave only 50% kill of Coronopus didymus. Resistant weeds were Chenopodium album and grasses including Panicum capil-lare, Digitaria sanguinalis and Portulaca oleracea. Chlorpropham 4 no. pre-em. controlled P. persicaria in fodder beet. MCA 20 no. slightly reduced the yield of peas (compared with the handweeded control) when applied at the 8 node, but not the 3 node, stage.

Accession: 014299225

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