Identification, distribution, and hosts of spp. infecting horticultural crops in Florida, USA with focus on .

Many root-knot nematode (RKN) species in the genus occur in Florida, including , a species able to overcome RKN resistance genes in many crops. The distribution of these nematodes in horticultural crops is not well known. A RKN survey was conducted in South and Central Florida aiming to: (i) identify RKN infecting vegetables, fruit, and other crops; (ii) document host plants; (iii) determine RKN distribution; and (iv) gain insight on the relatedness of obtained in this study with other populations from the USA and other countries.

sp. nov., a novel bacterial species causing leaf spots on strawberry (×).

In Florida, angular leaf spot, caused by , was the only known bacterial disease in strawberry, which is sporadic and affects the foliage and calyx. However, from the 2019-2020 to 2023-2024 Florida strawberry seasons, unusual bacterial-like symptoms were observed in commercial farms, with reports of up to 30 % disease incidence. Typical lesions were water-soaked and angular in early stages that later became necrotic with a circular-ellipsoidal purple halo, and consistently yielded colonies resembling on culture media.

sp. nov. Causing Anthracnose Leaf Spot of × (Araceae) in Florida, U.S.A.

Caladium ( × ) is an ornamental plant popular for its variable and colorful foliage. In 2020, plants showing leaf spots and blight, typical of anthracnose, were found in a field trial at the University of Florida's Gulf Coast Research and Education Center in Wimauma, Florida, U.S.

New Genotypes of Found on Strawberry in Florida.

is the most common causal agent of Phytophthora crown rot and leather rot of strawberry, but is also responsible for the disease in Florida. Studies of populations have suggested that different groups of genotypes are associated with different hosts; however, it is not yet clear how many lineages exist globally and how they are related to different production systems. The aim of this study was to determine the genetic relationships of isolates from Florida strawberry with genotypes reported from other hosts, quantify the genetic variation on strawberry, and test for an association with nursery source.

Identification of sequence mutations in Phytophthora cactorum genome associated with mefenoxam resistance and development of a molecular assay for the mutant detection in strawberry (F. × ananassa).

Phytophthora crown rot (PhCR) caused by Phytophthora cactorum is one of the most damaging diseases of strawberry worldwide. Mefenoxam is one of the major fungicides currently used to manage PhCR. However, the emergence and spread of resistant isolates have made controlling the pathogen in the field problematic.

Efficacy of Single- and Multi-Site Fungicides Against spp. of Strawberry.

Recently, the Florida strawberry industry faced unprecedented outbreaks of an emerging disease caused by the fungus spp. Currently, there are no fungicides labeled to control this disease in the United States and the efficacy of single- and multisite fungicides is unknown. Therefore, this study aimed to determine the in vitro sensitivity of spp.

Phosphite Is More Effective Against Phytophthora Crown Rot and Leather Rot Caused by than .

Phytophthora crown rot (PhCR) and leather rot (LR) caused by spp. are major threats to strawberry production worldwide. In the United States, these diseases are mainly caused by ; however, has also been recently reported causing PhCR.

Development of a Molecular Tool for Identification of a New sp. Associated with Disease Outbreaks on Strawberry.

A new sp. was recently reported causing outbreaks of leaf spot and fruit rot on strawberry in Florida, Georgia, and South Carolina. In contrast to other pathogens, the new species appears more aggressive and destructive on strawberry.

Resistance of Strawberry Cultivars and the Effects of Plant Ontogenesis on and Causing Crown Rot.

Phytophthora crown rot (PhCR) is an important disease of strawberry worldwide. is the most common causal agent, however, was also recently reported causing PhCR in the U.S.

Causing Leaf Spots on Commercial Blackberry ( sp.) in Florida.

Blackberry ( L. subgenus Watson) is a deciduous berry crop that is the fourth most economically important berry crop, and its production is expanding in the southeastern United States. However, since most commercially available cultivars were bred under temperate conditions, they are not always well adapted and could be threatened by new pathogen populations inhabiting subtropical areas.

First Report of Leaf Rust on Blackberry ( spp.) Caused by in Florida.

During the fall of 2020 and summer of 2021, symptoms of leaf rust were observed on blackberry plants of 'Kiowa', and breeding line 1734 (progeny of 'Natchez' and Arapaho') in a field trial at the University of Florida, Wimauma, FL. Symptoms consisted of small chlorotic spots (1 to 3 mm) on the upper side of the leaf, while the underside had yellow-orange pustules. Disease incidence was up to 100% on both 'Kiowa' and the breeding line 1734, and severity was up to 20% with most of the symptoms observed on older leaves.

Detection and Characterization of Quinone Outside Inhibitor-Resistant and . Causing Leather Rot in Florida Strawberry.

and . cause leather rot (LR) of fruit and Phytophthora crown rot (PhCR) in strawberry. LR occurs sporadically but can cause up to 70% fruit loss when weather is conducive.

Phytophthora Crown Rot of Florida Strawberry: Inoculum Sources and Thermotherapy of Transplants for Disease Management.

Phytophthora crown rot, caused mainly by but also by , reported in 2018, is an important disease in the Florida strawberry annual production system. Mefenoxam is the most effective and widely used fungicide to manage this disease. However, because of pathogen resistance, alternatives to chemical control are needed.

Resistance to Mefenoxam of and Causing Crown and Leather Rot in Florida Strawberry.

and cause leather rot on fruit and crown rot (PhCR) of strawberry plants. Leather rot is not a common disease in Florida; however, up to 50% yield loss has been reported in harvests after intense rainfall events. PhCR is an important disease worldwide and is characterized by a sudden wilting and collapse of plants.

Development of a Multiplex High-Throughput Diagnostic Assay for the Detection of Strawberry Crown Rot Diseases Using High-Resolution Melting Analysis.

Rapid and accurate disease diagnosis is a prerequisite for an effective disease management program in strawberry production. In Florida, spp., spp.

First Report of Causing Stem Canker of Hemp ().

Hemp is an annual herbaceous plant that is used for its fiber and oil in a variety of commercial and industrial products. In Florida, it is currently being explored as a new specialty crop. During a field trial from October to January 2019 in Wimauma, FL, a stem canker was observed on up to 60% of three-month-old plants of 'Eletta Campana', 'Carmagnola Selezionata', and 'Tygra'.

First Report of Causing Strawberry Fruit Rot in Florida.

During the 2019-2020 Florida strawberry season (October to April), a strawberry () fruit rot was observed in two fields (Plant City and Wimauma, FL) with up to 5% incidence on short-day cultivars Sensation Florida127, and Florida Brilliance. Symptoms on pink and ripe fruit consisted of softening, discoloration, watery rot with white fuzzy mycelium, and initial sclerotium formation. Diseased tissue was placed on General Isolation (GI) medium (Amiri et al.