kalkhoffi and Stigmina lautii on blue spruce at the Nova Scotia site, the main target pest was L. At the Ontario site, the main target pests were R. In this multi-faceted trial, seven new active ingredients, selected based on their efficacy against related fungi and availability, were screened for efficacy against needlecast diseases.Įxperiments were conducted in 20 at two sites in Ontario and Nova Scotia. Screening trials and subsequent efficacy trials that lead to new fungicide registrations for conifer needlecasts, would arm growers and landscapers with efficacious rotational products. The few fungicides available to control needlecast diseases often did not provide adequate control. At the initiation of this project, recommendations for the control of needlecast diseases were to apply fungicides to the current season's growth from bud break to hardening off (late summer). The presence of Rhizosphaera needlecast on spruce is a concern in Ontario because of the unsightly appearance of infected foliage and threat it poses to tree health. The presence of Lirula needlecast can result in conifer tree growers having to trim off the lower diseased branches in order to have saleable Christmas trees, thus significantly lowering the wholesale value of the trees. Two common needlecast diseases include Lirula needlecast caused by Lirula nervata on balsam fir and Rhizosphaera needlecast caused by Rhizosphaera kalkhoffi on spruce. In Canada, needlecast diseases present some of the greatest challenges for commercial conifer tree growers and are also a significant issue on conifers that are established in the landscape and in windbreaks. In addition, methods to detect the presence of the pathogens in asymptomatic needles will be developed. To assess the potential of selected fungicides for needlecast control on two conifer species, Colorado spruce ( Picea pungens) and balsam fir ( Abies balsamea) and to provide recommendations for candidate fungicides to be pursued for registration in Canada. Comprehensive Tree Care on Your Rochester, MN, Property 2.Jim Jotcham - Marbicon Incorporated Objective.The Three Stages of Early Spring Lawn Care in Winona, MN 2.27.Lawn Care and Pest Management in Winona, MN 3.13.Springtime Tree Care and Health Evaluations in Winona, MN 4.12.Weed Removal Methods for Rochester, MN Property Owners 4.27.Spring Plant Care for Your Rochester, MN Gardens 5.26.Combatting Lawn Pests in Winona, MN 5.30.How to Tell If Your Trees Need Pruning in Rochester, MN 6.27.Lawn Health Symptoms: Overwatered Grass in Winona, MN 6.30.
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