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J.H. Dunn, D.D. Minner, B.F. Fresenburg, and S.S. Bughrara

We evaluated the effect of fertilization treatments in combination with clippings disposal on perennial ryegrass (Lolium perenne L.) in two adjacent locations. Clippings left on turf during mowing decreased dollar spot (Sclerotinia homoeocarpa F.T. Bennett) in both locations during three summers compared with clippings removed in mower baskets. However, brown patch (Rhizoctonia solani Kuhn) increased during July and Aug. 1995 when clippings were left on turf. Dollar spot was more severe with N (kg·ha–1·year–1) at 120 compared to 240; brown patch was more severe at 240. While clippings disposal had significant effects on disease incidence, implementation may not be practical because of the contrary responses of the observed diseases to this management approach.

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Delbert D. Hemphill Jr.

Agricultural plastics area significant contributor to solid waste disposal problems, particularly in areas with heavy use of plastic-covered greenhouses or mulch films. Field-burning and landfilling are no longer viable options for disposal in many areas. Reuse and reduced weight of films are two methods to reduce the amount of material requiring disposal. Recycling, incineration, and on-site degradation appear to be the most-promising technologies for disposal. Each technology has its drawbacks. These include dirt and pesticide residues on mulch films, the presence of stabilizers and photoactivators, possible limitations to recycling mixtures of types of plastics, and high costs for recycling and incineration facilities. This is an active area of research for many members of the American Society for Plasticulture.

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Brian K. Hogendorp and Raymond A. Cloyd

Sanitation, which includes removing plant and growing medium debris, is an important component of any greenhouse or nursery pest management program. However, there is minimal quantitative information on how sanitation practices can reduce pest problems. In this study, conducted from May through Nov. 2005, we evaluated plant and growing medium debris as a source of insect pests from four greenhouses located in central Illinois. Two 32-gal refuse containers were placed in each greenhouse with a 3 × 5-inch yellow sticky card attached to the underside of each refuse container lid. Each week, yellow sticky cards and plastic refuse bags were collected from the containers and insects captured on the yellow sticky cards were identified. Insects captured on the yellow sticky cards were consistent across the four greenhouses with western flower thrips (Frankliniella occidentalis), fungus gnats (Bradysia spp.), and whiteflies (Bemisia spp.) the primary insects present each week. Insect numbers, in order of prevalence on the yellow sticky cards, varied across the four locations, which may be related to the type of plant debris discarded. For example, extremely high numbers of adult whiteflies (range = 702 to 1930) were captured on yellow sticky cards in one greenhouse each month from August through November. This was due to the presence of yellow sage (Lantana camera), bee balm (Monarda didyma), garden verbena (Verbena × hybrida), common zinnia (Zinnia elegans), sage (Salvia spp.) and fuchsia (Fuschia spp.) debris that was heavily-infested with the egg, nymph, pupa, and adult stages of whiteflies. High western flower thrips adult numbers in the greenhouses were generally associated with plant types such as marguerite daisy (Dendranthema frutescens) and pot marigold (Calendula officinalis) disposed while in bloom with opened yellow flowers, which contained adult western flower thrips. Based on the results of this study, it is important that greenhouse producers timely remove plant and growing medium debris from greenhouses or place debris into refuse containers with tight-sealing lids to prevent insect pests from escaping.

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Proceedings of the Workshop Waste Product Utilization and Disposal in Horticultural Crops

held at the 89th ASHS Annual Meeting Honolulu, Hawaii 5 August 1992

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Maycon Diego Ribeiro, Rhuanito Soranz Ferrarezi, and Roberto Testezlaf

disposal of nutrients and pesticides ( Montesano et al., 2010 ). This system can increase crop production through the higher water and fertilizer use efficiency, resulting in higher plant uniformity and anticipating the growth time ( Dumroese et al., 2006

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Margarita Velandia, Karen L. DeLong, Annette Wszelaki, Susan Schexnayder, Christopher Clark, and Kimberly Jensen

disposing of PE mulch at landfills or other even less desirable disposal methods (e.g., burning). At the end of season, farmers remove PE mulch and dispose of it in landfills, stockpile it on the farm, or burn it on site ( Kasirajan and Ngouajio, 2012

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Jen A. Sembera, Tina M. Waliczek, and Erica J. Meier

, 2008 ). Proper disposal of harvested invasive plant parts is an important consideration because many invasive plants reproduce easily and successfully both sexually and asexually where any plant propagule could potentially produce new stands of plants

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Mohammed B. Tahboub, William C. Lindemann, and Leigh Murray

( Cabral, 2005 ). Pruning wood is currently burned as an economic means of disposal. However, the New Mexico Environment Department and the U.S. Environmental Protection Agency are concerned with this practice and may restrain, prohibit, or otherwise

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Jenny C. Moore and Annette L. Wszelaki

14.7 × 10 5 tons in 2017 ( Gao et al., 2019 ). Although PE mulch has many advantages, there are also growing disadvantages, largely due to disposal challenges and potential soil and water contamination. Removal from the field is labor intensive, and