Agropyron repens

Two studies have suggested that quackgrass (Agropyron repens L.) can reduce K uptake by maize (Zea mays L.) plants. Bandeen and Buchholtz (11) found that K+, but not N or P0, content of corn was decreased by quackgrass growing with maize. Because high levels of fertilization did not overcome the effect of quackgrass, the authors concluded that competition was not responsible (11, 12). 

Zea mays Hordeum vulgare (Poaceae)4 Agropyron repens (Poaceae)63 Acanthus mollis84... 

Friebe, A., Schulz, M., Kiick, P., and Schnabl, H. 1995. Phytotoxins from shoot extracts of Agropyron repens seedlings. Phytochemistry 38, 1157-1159... 

DIBOA OH H H Secale cereale (Poaoeae) [1,34,35,65-67] Saccharum officinale (Poacea) [38] Triticum aeslivum (Poaceae) [16-18,39-41,68] Zea mays (Poaceae) [60,69] Hordeum vulgare (Poaceae) [25] Agropyron repens (Poaceae) [63,70] Acanthus mollis (Acanthaceae) [43] Aphelandra tetragona (Acanthaceae) [71] Consolida orientalis (Ranunculaceae) [42]... 

Plantago major presents an exception because it is the only dicot tested exhibiting BOA-N-glucosylation comparable with com. As the species colonizes disturbed localities it is possibly under a strong selection pressure. Carduus nutans and Daucus carota are able to co-exsist with Agropyron repens, a very aggressive monocot that contains benzoxazinones as secondary constituents, which are released by root exudation. This association may explain the relatively well developed detoxification capacity. 

Species with good detoxification capacities ( associated with Agropyron repens)... 

At the same application rate as alachlor, acetochlor has stronger and longer lasting action. It is also effective for the control of Agropyron repens and Cyperus spp. (Anonym, 1971). Its selectivity is the same as that of alachlor. 

Propyzamide is effective mainly for the control of germinating weeds. It is absorbed through the roots, in Agropyron repens also through the rhizomes when applied in their vicinity. The absorbed herbicide inhibits the root and stem growth of sensitive plants. After treatment, normal cell division stops within a short time. Thus, primary action is manifested by the inhibition of mitosis (Carlson et al.,... 

At higher dosage it is effective over the whole growing season against some weeds that are difficult to combat, in particular Agropyron repens and Agrostis alba. 

Kemmer (1978) investigated the effect of the herbicide Roundup on stubble-field against Agropyron repens at application rates of 4-6-8 l/ha and found that the effect depends more on the time of application than on the dose. For optimal effect spraying must be done at least two weeks before ploughing. 

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