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Category: Agriculture

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

Postbloom Fruit Drop (PFD) Identification and Management

PFD brochure

This two-sided ID card is idea for growers working in the field trying to identify or manage postbloom fruit drop (PFD) in citrus.  The ID card includes photos of blooms affected by PFD and photos of healthy blooms for… Read More

Tea Shot-Hole Borer Euwallacea fornicates (Eichhoff, 1868) (Insecta: Coleoptera: Curculionidae: Scolytinae)

Figure 1. Adult Euwallacea fornicatus (Eichhoff). A-B female, C-D male.

The tea shot-hole borer is an Asian ambrosia beetle introduced to Florida in the early 2000s. In Florida it does not have any known economic impact, but it is a serious pest of tea around the world and… Read More

Vespiform Thrips Franklinothrips vespiformis Crawford (Insecta: Thysanoptera: Aeolothripidae)

Figure 1. Female vespiform thrips showing constricted waist and white band. Credit: Runqian Mao, University of Florida

Franklinothrips vespiformis Crawford is a predatory thrips with a pantropical distribution. The distinctive red, humped-back larvae and fast-moving ant-like adults are predaceous on small arthropods. In addition to being easily mistaken for an ant, this beneficial thrips is… Read More

Black Scale Saissetia oleae (Olivier, 1791) (Insecta: Hemiptera: Coccoidea: Coccidae)

Figure 1. Adult female black scales, Saissetia oleae (Olivier) on cultivated olive (Olea europaea L.). Credit: Lyle Buss, University of Florida

The black scale is an important pest of citrus and olive trees. Originally from South Africa, this scale is now distributed worldwide. In Florida, black scale is found on citrus, cultivated olive, avocado, and many popular landscape plants…. Read More

Black Turpentine Beetle, Dendroctonus terebrans (Olivier) (Insecta: Coleoptera: Curculionidae: Scolytinae)

Figure 1. Dorsal view of an adult black turpentine beetle, Dendroctonus terebrans (Olivier). Its large size, trapezoidal pronotum, and rounded declivity distinguish it from all other bark beetles infesting pines in the southern United States. Credit: Adam Black and Jiri Hulcr, University of Florida

Black turpentine beetles bore into the inner bark of stressed or injured pines, where they breed and feed on phloem tissue. Adults are strongly attracted to volatile pine odors and readily breed in fresh stumps. In typical forests,… Read More

An ambrosia beetle Xyleborus affinis Eichhoff, 1868 (Insecta: Coleoptera: Curculionidae: Scolytinae)

Figure 1. Adult female Xyleborus affinis. Credit: Jiri Hulcr, UF/IFAS

Xyleborus affinis is one of the most widespread and common ambrosia beetles in the world. It is also very common in Florida. Like other ambrosia beetles, it bores tunnels into the xylem of weakened, cut or injured trees… Read More

Dagger Nematode Xiphinema spp. (Cobb, 1913) Inglis, 1983 (Nematoda: Enoplea: Dorylaimia: Dorylaimina: Xiphinematinae)

Figure 9. Schematic diagram showing detailed morphological features of a dagger nematode, Xiphinema spp.

Dagger nematodes parasitize plants. They cause economic damage and death of host crops through feeding on the roots and by spreading viral mosaic and wilting diseases, but field studies have shown that some control measures targeting reduction in… Read More

Doveweed (Murdannia nudiflora) Control in Warm-Season Turfgrass Species

Doveweed is an aggressive, naturalized summer annual weed that rapidly invades warm-season turfgrass species, especially in residential lawns, and few herbicides can effectively control it. Because of these challenges, a well-designed management strategy is necessary for doveweed control…. Read More

Can Calcium Propionate Help Maintain Calcium Concentrations and Prevent Metritis in Dairy Cows with Dystocia?

04390S cows at sunrise - agriculture

Studies have suggested that giving dairy cows supplemental calcium may reduce the incidence of metritis. This study tested this hypothesis with cows at the UF Dairy Unit and found that calcium supplements actually did not benefit postpartum health… Read More