1Data from Pendleton and Weis, (1977). Planted May 15; harvested October 72Pounds of dry pods/acre39/9/76Growers should also consider varieties developed in Ontario at the University of Guelph (i.e., OAC Garroy, OAC Tango, or OAC Ruby.). Garroy is a red-seeded Valencia type with an erect plant habit that yields consistently higher than U.S. varieties. Ruby is a higher-yielding replacement for Garroy. Ontario varieties are usually planted at the same time as soybeans and should mature in 110 to 120 days. Seed for these varieties can be obtained from Department of Crop Science, University of Guelph, Guelph, Ontario N1G 2W1.E. Weed Control:Weeds can lower yields significantly and make harvesting difficult. Peanut plants grow more slowly than soybeans and take almost three months to achieve a complete ground cover. As a result the combination of cultivation and herbicides is usually necessary. In major peanut production states, crop rotation is the first step in a sound weed management program.1. Mechanical: Cultivation requires the use of sweeps to skim just beneath the soil surface or use of carefully adjusted rotary gangs (rolling cultivator). Precise depth and lateral control of either cultivator is necessary to avoid making preemergence herbicide (if applied) ineffective or causing peanut injury with an accompanying reduction in yields and quality. Improper cultivation will damage plants and provide an entry point for disease organisms. Soil thrown on plants by cultivation will inhibit flower, peg, and pod development. When preemergence or
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