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Category: Pests & Disease

Guidelines for Purchasing and Using Commercial Natural Enemies and Biopesticides in North America

Green lacewing adult

This guide provides assistance in selecting, purchasing, and using commercially available natural enemies and biopesticides for managing pest problems. The guide assists in the identification of pests by habitat and lists types of natural enemies (parasitic nematodes, predatory… Read More

Avian Diseases Transmissible to Humans

Chickens feeding in their coop. Photos from the Smathers Archives.

Anyone who keeps birds, whether as pets or as production animals, should be aware that certain avian diseases can be transmitted to humans. The seriousness of the disease in humans varies with human hosts’ age, overall health, and… Read More

Maximizing Weed Control in Florida Citrus

citrus groves, florida, oranges, leaves, trees. UF/IFAS Photo: Thomas Wright.

With Florida citrus growers and production managers being “squeezed” between rising production prices and declining yields from citrus greening, there’s more call than ever to reduce citrus production costs. Controlling weeds is a major expense, amounting to 11%… Read More

Candidatus Liberibacter solanacearum”: An Emerging Pathogen Infecting Potato and Tomato

Green tomatoes

A bacterium called “Candidatus Liberibacter solanacearum” infects potatoes and tomatoes, causing zebra chip in potatoes and psyllid yellows in tomatoes.  These disease are highly destructive and have been known to reduce yields by up to 85%.  “Ca. L. solanacearum” has… Read More

Fungal Gummosis in Peach

Figure 1. A peach limb with the blister symptom of fungal gummosis caused by Botryosphaeria dothidea. Credit: L. Pusey, USDA-ARS

Fungal gummosis in peach occurs when the fungus Botryosphaeria dothidea infects small openings or wounds in tree branches or trunks. The disease causes blisters on the tree that form lesions and eventually ooze gum (sap). This 3-page fact… Read More

Plant Diagnostic Clinic and HLB Lab

Figure 2. Southwest Florida Research and Education Center Credit: UF/IFAS

The Plant Pathology program at the UF/IFAS Southwest Research and Education Center is the state and local resource for plant diagnostic services, including HLB (Huanglongbing, or citrus greening) detection, and for insect identification. This brochure covers the center’s… Read More

Phytophthora Identification and Sampling in Citrus Nurseries

phytophthora id brochure

Phytophthora species are important soil-borne, fungus-like pathogens that attack the root systems, trunk, and fruit of citrus trees at any age. The front of this identification sheet includes images of healthy and infested roots and descriptions of leaf… Read More

Fungal Peach Gummosis

Figure 3. Coalesced fungal gummosis lesions on 2-year old ‘Flordaguard’ peach rootstock caused by Botryosphaeria dothidea. Credit: M. Olmstead

Fungal gummosis in peach occurs when the fungus Botryosphaeria dothidea infects small openings or wounds in tree branches or trunks.  The disease causes blisters on the tree that form lesions and eventually ooze gum (sap).  This 3-page fact sheet covers… Read More