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Chuck Ingels and John Roncoroni

( Anderson, 2001 ). Weeds should be controlled in the fall or winter before planting using broad-spectrum herbicides, and/or preemergent herbicides can be used immediately following planting. Nonchemical preplant strategies include weed flaming, sheet

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Wiley Carroll Johnson III and Jerry W. Davis

nonselective, although crop tolerance varies. Herbicides derived from natural sources have been investigated for weed control in certified organic crop production with many reports focused on the evaluation of performance on warm-season weeds. These studies

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H.F. Abouziena, O.M. Hafez, I.M. El-Metwally, S.D. Sharma and M. Singh

Egyptian citrus, especially organic fruits, is exported to many countries. Weeds compete with citrus for nutrients and water, they harbor pests and host pathogens, and they lower the efficiency of orchard operations ( Tucker and Singh, 1984

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Suzanne P. Stone, George E. Boyhan and W. Carroll Johnson III

reduced tillage on watermelon production and found no statistically significant differences between reduced tillage and tillage treatments ( Butler et al., 2016 ). Weeds are severe in the humid, subtropical southeastern United States, and they are a major

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Jacob C. Domenghini

to control weeds in vegetable crop and other agronomic production systems ( Boyd et al., 2006 ; Evans et al., 2009 ; Radhakrishnan et al., 2002 ), as well as the effects that natural products have on the desired crop ( Bingaman et al., 2000 ; Evans

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Megh Singh, Mayank Malik, Analiza H.M. Ramirez and Amit J. Jhala

). Weed competition is damaging to citrus trees, especially when they are young, because it slows the tree growth and increases susceptibility to insects and diseases ( Rogers et al., 2006 ). Weeds around tree trunks may create a favorable environment for

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Levi Fredrikson, Patricia A. Skinkis and Ed Peachey

Weeds can compete with young wine grape vines for soil moisture and nutrients and can impact yield and fruit quality ( Byrne and Howell, 1978 ). Root systems of young vines are small and subject to greater suppression of vine growth owing to weed

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Jose G. Franco, Stephen R. King, Joseph G. Masabni and Astrid Volder

Weed management in agricultural systems is the single greatest input of labor and chemicals ( Dayan et al., 2011 ; Wang et al., 2009 ). Weeds compete with the crops for moisture, nutrients, and light. Therefore, weeds, more so than any other pest

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Husrev Mennan and Mathieu Ngouajio

), hairy vetch ( Vicia villosa ), red clover ( Trifolium pratense ), and annual medics ( Medicago sp.) have been used widely as winter cover crops to suppress broadleaf and grass weeds in diverse cropping systems. Recently, brassica cover crops have

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Gerald M. Henry, Jared A. Hoyle, Leslie L. Beck, Tyler Cooper, Thayne Montague and Cynthia McKenney

the orchard floor. Goff et al. (1991) reported less K, Ca, and Mg concentrations in pecan [ Carya illinoinensis (Wangenh.) C. Koch] tree leaves growing in plots infested with weeds compared with plots where weeds were controlled through use of