Plant Pests and Diseases
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San Jose scale, Comstockaspis perniciosus (Comstock), is a pest of peaches, nectarines, plums, and other tree fruits including apples, pears, and cherries. San Jose scale is considered a secondary pest in many regions of the country, but in the Southeast U.S., it has been one of the most common and most destructive pests to the peach industry since the early 2000s.
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2022 plant disease losses, including control costs, amounted to an estimated $933 million. The value of the crops used in this estimate was approximately $8200 million, resulting in a 11.4% relative disease loss across all crops included in this summary. The estimated values for most crops used to compute these disease losses are summarized in the UGA Center for Agribusiness & Economic Development 2022 Georgia Farm Gate Value Report (AR-24-01). Some estimates for fruits, ornamentals, and turf rely on Extension specialists’ knowledge of the industry and industry sources for information.
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Blueberries are becoming the state fruit of Georgia with considerable acreage planted. Blueberries have many pest challenges and a current invasive pest challenge from spotted wing drosophilia (SWD). While efforts are underway to release new biocontrol agents for SWD, we still know little about the natural enemies in blueberry systems. Here we provide an overview of common natural enemies and conservation strategies for preserving beneficial species in blueberry systems. The work was funded by the NRCS to provide new information on natural enemies and pollinators and help with design and implementation of habitat management concepts.
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Pierce’s disease (PD) may be the greatest threat to the growth and sustainability of wine grape industries in the Southeastern U.S. The first step to managing grapevine PD is understanding the threat of PD as dictated by the region in which vines will be planted. It is highly advised that PD-tolerant cultivars be planted if a vineyard will be established in a region of high PD-threat. Growers should understand that there is a risk of planting Vitis vinifera and other PD-intolerant cultivars in several Southeastern U.S. regions, including the mountain regions of northern Georgia and piedmont regions in North Carolina. If PD-intolerant cultivars are planted, leafhopper vectors should be intensively scouted for and managed, and PD-infected vines should be immediately rogued out of the vineyard.
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Plum curculio, Conotrachelus nenuphar (Herbst), is a key insect pest of peaches in the Southeast region of the United States. It is a snout beetle native to North America and is found east of the Rocky Mountains in the U.S. and Canada. Plum curculio drives the insect pest management program for Georgia peach producers. This circular covers the biology, damage, and current management recommendations for plum curculio in Georgia peach production.
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Bacterial diseases are among the major production and economic challenges that onion growers face in Georgia. There are six bacterial diseases that commonly affect onion foliage and bulbs in the state. These diseases are difficult to manage and rely mainly on cultural practices and the use of protective bactericides. Host resistance is limited with little information on pathogen biology and the infection process. This bulletin provides a comprehensive outlook on specific symptoms associated with bacterial diseases, modes of infection and spread, and potential management options.
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La bermuda es una planta perenne de estación cálida ampliamente utilizada para su uso como césped en el sudeste de los Estados Unidos.
[Although improved common (Cynodon dactylon (L.) Pers.) and hybrid bermudagrasses (Cynodon dactylon x C. transvaalensis Burtt-Davy) have desirable qualities as turfgrasses for heat, drought and wear tolerance, bermudagrass is a problematic weed when grown in mixed stands with other turf species. Selective control of bermudagrass is difficult but often warranted in order to maintain acceptable quality of the desired turfgrass species. This publication describes bermudagrass control methods for Southern lawns.]
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La lespedeza común (Kummerowia striata (Thunb.) Schind syn. Lespedeza striata) es una leguminosa anual de verano sin organización en sus ramificaciones, que es una maleza problemática en céspedes de jardines residenciales así como en otras áreas de césped.
[Common lespedeza (Kummerowia striata (Thunb.) Schind syn. Lespedeza striata) is a freely branched, summer annual legume that is a problematic weed in lawns and other turf areas. This publication describes ways to identify and control Lespedeza in turfgrass, including cultural control methods, preemergence herbicides and postemergence herbicides.]
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This publication discusses ways to identify and control Virginia buttonweed, a troublesome broadleaf weed in turfgrasses throughout the Southeast.
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