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Efficacy of trenching, rootstock, and compost to manage peach replant disease.
R. POKHAREL (1). (1) Colorado State University, Grand Junction, CO, U.S.A.

Replant diseases in peach caused by various pathogens are difficult to manage because of limited availability of effective broad spectrum chemicals. This study, part of an ongoing non-replant project at Western Colorado Research Center, investigated the effect of trenching, compost, and rootstock to manage replant disease on tree growth, compared with that of a non-replant site. Sierra Rich peach trees on Lovell, Nemaguard, St. Julian, and Viking and Zee Lady only on Viking rootstock were planted on a replant site with trenched (opened for a summer) ground with or without compost and a replant non-trenched ground (control) with 3-4 replications and a non-replant site with 40 replications in a completely randomized design. Tree growth, calculated from the tree circumferences measured at planting and after the first growing season, was analyzed using Proc GLM of SAS. Sierra Rich tree growth at non-replant site was significantly higher as compared to trees in replanted site irrespective of rootstocks whereas trees of both the varieties on Viking produced significantly higher growth. At replant site, trees on a trenched ground produced significantly higher growth as compared to control. Within trenched ground, trees on Viking and Nemaguard produced significantly higher growth with compost but not the trees on Lovell and St. Julian. The tree growth at non-replant site and on a replant trenched ground was 15 and 6.0 to 6.5 times higher, respectively than control.<p><p>Keywords: NA, Fruits-Nuts

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