Tag Archive: Spot

Algal Leaf Spot Common on Magnolias and Camellias

Algal leaf spot, also known as green scurf, is commonly found on thick-leaved, evergreen trees and shrubs such as magnolias and camellias.  It is in the genus Cephaleuros and happens to be one of the only plant parasitic algae found in the United States.  Although commonly found on magnolias and camellias, algal leaf spot has a …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2017/06/29/algal-leaf-spot-common-on-magnolias-and-camellias/

Conditions are Favorable for Bacterial Spot in Fall Tomatoes

Typical bacterial spot symptoms on a tomato leaf. Credit: University of Florida/IFAS High temperatures and wet weather produce the perfect conditions for the onset of bacterial spot in tomato fields. The disease is caused by various species of Xanthomonas bacteria. Small spots (1/8 inch) form on leaves, stems, and fruit. The leaf spots are sometimes outlined in …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2015/10/02/conditions-are-favorable-for-bacterial-spot-in-fall-tomatoes/

Season’s First Incidence of Cotton Corynespora Target Spot Confirmed in Santa Rosa County

Fig1: Target spot on cotton. This season’s first incidence of Corynespora target spot in cotton has been confirmed in Santa Rosa County. By: Dr. Michael J. Mulvaney (Cropping Systems Specialist, University of Florida, IFAS Extension, West Florida Research and Education Center, Jay, FL), Dr. Nicholas S. Dufault (Dept. of Plant Pathology, University of Florida, IFAS …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2015/07/10/seasons-first-incidence-of-cotton-corynespora-target-spot-confirmed-in-santa-rosa-county/

Summer Break Spot

Summer Break Spot With school out for the summer, many children may miss out on a meal they normally would receive through USDA’s school meals programs. Florida’s at-risk children now can have meals all summer long. The Summer Break Spot Program, also known as the Summer Food Service Program, is federally funded under the U.S. …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2015/06/26/summer-break-spot/

Update on 2014 peanut leaf spot fungicide trials in Citra, FL.

Figure 1. An aerial image of 2014 peanut leaf spot fungicide trial from the University of Florida Plant Science Research and Education Unit in Citra, FL on 9/25/14. The management of early and late leaf spot in peanuts is an essential task for growers each year. Currently, there are a number of fungicide products available …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2015/03/28/update-on-2014-peanut-leaf-spot-fungicide-trials-in-citra-fl/

Pepper Spot Showing Up in Panhandle Peanuts

Pepper Spot, Photo Credit: North Carolina State As we head into the home stretch of  2014 peanut production, most farmers are working diligently to mange and control leaf spot and white mold in their peanuts. Many farmers are familiar with Early and Late leaf spot and the occasional chemical related spotting on the leaves of …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2014/08/23/pepper-spot-showing-up-in-panhandle-peanuts/

Watermelon Novel Bacterial Leaf Spot Research Update

Fig. 1. Symptoms of the Pseudomonas syringae leaf spot on watermelon Pseudomonas Syringae Leaf Spot on Watermelon Mathews Paret, Eric Newberry, Nick Dufault, Josh Freeman, Bob Hochmuth, Anthony Drew, David Langston and Jeff Jones Florida and Georgia are the two largest producers of watermelon in the United States with 48,000 acres under production and a …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2014/06/27/watermelon-novel-bacterial-leaf-spot-research-update/

Leaf Spot Appears in Panhandle Peanuts

Fungal Leaf Spot is threatening peanut yields in Panhandle Florida. Currently the disease is developing in the lower canopy. As the leaf spot progresses the lower leaves will begin to fall off, and the disease will quickly progress into the upper canopy. Evidence of the exceptionally wet weather in July and August is beginning to …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2013/09/27/leaf-spot-appears-in-panhandle-peanuts/

Target Spot on the Increase in Cotton

Target spot is caused by the fungal pathogen Corynespora cassiicola. Leaf spots usually are up to ¼ to ½ inch in diameter and have a distinct “target spot” pattern with alternating light and dark brown bands of dead tissue. Target spot disease was confirmed from a sample taken in Santa Rosa County on June 27 …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2013/07/26/target-spot-on-the-increase-in-cotton/

Cotton Leaf Spot Severe in Santa Rosa County

Target spot/Corynespora leaf spot disease has increased in recent weeks.  Many Santa Rosa County fields have been treated at least once with either Twinline or Headline fungicides. The frequent showers appear to be a critical trigger for disease development and spread. During the past week target spot has caused over 50 percent defoliation in some …

Continue reading »

Permanent link to this article: http://jackson.ifas.ufl.edu/newsletters/2012/08/24/cotton-leaf-spot-severe-in-santa-rosa-county/