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Bala Rathinasabapathi, James Ferguson, and Mark Gal

Shredded and chipped wood mulches are used for weed suppression in perennial fruit crops, in urban landscapes, and occasionally in vegetable crops. Wood chip mulches with weed-suppressing allelochemicals may be more effective for weed control, especially under sustainable and organic production systems, than mulches without such properties. The objective of this study was to test for the presence of water-soluble allelochemicals in wood chips derived from tree species, often found in wood resource recovery operations in the southeastern US. Presence of allelochemicals in water eluates of woodchips and leaves was evaluated in a lettuce bioassay. Eluates of wood chips from red maple (Acer rubrum L.), swamp chestnut oak (Quercus michauxii Nutt.), red cedar (Juniperus silicicola L.H. Bailey), neem (Azadirachta indica A. Juss.), and magnolia (Magnolia grandiflora L.) highly inhibited germinating lettuce seeds, as assessed by inhibition of hypocotyl and radicle growth. The effects of wood chip eluates from these five species were more than that found for eluates from wood chips of black walnut (Juglans nigra L.,) a species previously identified to have weed-suppressing allelochemicals. Tests on red cedar, red maple, and neem showed that water-soluble allelochemicals were present not only in the wood but also in the leaves. In greenhouse trials, red cedar wood chip mulch significantly inhibited the growth of florida beggarweed (Desmodium tortuosum DC.), compared to the gravel-mulched and no-mulch controls.

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Megh Singh, Shiv D. Sharma, Analiza H.M. Ramirez, and Amit J. Jhala

activity of glyphosate has been observed on some citrus weeds such as goatweed ( Scoparia dulcis ), hairy beggarticks ( Bidens pilosa ), ivyleaf morningglory, and florida beggarweed (personal observation). Although glyphosate-resistant weed is not

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glyphosate, Singh et al. (p. 599) studied efficacy, absorption, and translocation of glyphosate. Among four weed species, florida beggarweed was the most sensitive and ivyleaf morningglory was the most tolerant to glyphosate. Increasing application rates

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Andrew J. Hephner, Tyler Cooper, Leslie L. Beck, and Gerald M. Henry

). Singh and Singh (2004) observed 80% to 88% control of redroot pigweed ( Amaranthus retroflexus L.), Florida beggarweed [ Desmodium tortuosum (Sw.) DC.], hairy beggarticks ( Bidens pilosa L.), tall morning glory [ Ipomoea purpurea (L.) Roth], and

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Biwek Gairhe, Peter Dittmar, Davie Kadyampakeni, Ozgur Batuman, Fernando Alferez, and Ramdas Kanissery

affecting absorption and bio-efficacy of glyphosate in Florida beggarweed ( Desmodium tortuosum ) Crop Prot. 20 6 511 516 Tang, L. Chhajed, S. Vashisth, T. 2019 Preharvest fruit drop in