Lowndes – Echols Ag News

Some relevant information on Powdery mildew of cucurbits

Powdery mildew is a common disease of cucurbits under field and greenhouse conditions in most areas of the United States.  Although all cucurbits are susceptible, symptoms are less common on cucumber and melon because many commercial cultivars have resistance. This disease can be a major production problem if not manage timely.

Podosphaera xanthii and Erysiphe cichoracearum are the two important fungal organisms that cause cucurbit powdery mildew. P. xanthii is a more aggressive pathogen than E. cichoracearum.  E. cichoracearum requires a lower temperature optimum and hence, this fungus is found mainly during cooler spring and early summer periods. In contrast, P. xanthii are more common during the warmer months.

The causal fungi are obligate parasites and therefore cannot survive in the absence of living host plants. Possible local sources of initial inoculum include conidia from greenhouse-grown cucurbits, and alternate hosts. Verbena, a common ornamental plant and also a common weed, could be an important source of inoculum.

Pathogenically distinct races of Podosphaera xanthii have been differentiated on muskmelon.  Races 1 and 2 have most common in the eastern United States recently.

Fungicides: Quintec, Proline, Torino (rotation in watermelon and cantaloupe)

Proline, Torino, Procure (rotation in other cucurbits)

Organic Vegetable Fertility and Weed Management Class

Dr. Tim Coolong will be coming down to teach a class for those who currently or interested in Small Organic Farming or Urban Gardening on February 23rd from 10:30-11:45. He will be talking about vegetable fertility and weed management. The information is below. If you have any questions, please contact Josh Dawson, Fort Valley Extension Agent.

2017 Production Meetings

Five row crop and vegetable production meetings are currently scheduled in Lowndes County. Commercial (cat. 21), and private pesticide credit will be given with each meeting to all license holders who attend and sign in.  Please call the office (333-5185) a few days ahead if you plan to attend so that plans can be made for the meal. I look forward to working with you this year and please contact me if you need anything.

Don’t let your license expire put these meetings on your calendar now.

  • January 10, 2017 Peanut Production andPeanut Insects
    12:00 noon Lowndes Extension Office
    Dr. Scott Monfort
    Dr. Mark Abney
  • January 13, 2017 Vegetable Production
    9:30 a.m. 4-H Center-Lake Park
    Dr. Stormy Sparks
    Dr. Tim Coolong
    Dr. Bhabesh Dutta
  • February 6, 2017 Row Crop Disease and Fertility
    12:00 noon Lowndes Extension Office
    Dr. Glen Harris
    Dr. Bob Kemerait
  • March 2, 2017 Cotton Production Cotton Insect
    6:00 pm Lowndes Extension Office
    Dr. Jarod Whitaker
    Dr. Phillip Roberts
  • March 8, 2017 Row Crop Weed Control
    12:00 noon Lowndes Extension Office
    Dr. Eric Prostko

Downy Mildew in Cabbage

Downy mildew has been found in a cabbage field in southwest Georgia.

Below is some information from Bhabesh Dutta, UGA extension plant pathologist.

Downy mildew of cabbage has been detected from Colquitt County in Georgia (Dec 9, 2016). These observations indicate that inoculum of downy mildew is currently in GA and under favorable conditions (cool and wet conditions) potential disease outbreak in cabbage and other cruciferous/cole crops can occur. I would suggest our growers to look for the downy mildew symptoms in their fields and start applying protective spray of below stated fungicides.

Fungicide application (a weekly schedule):

Tank mix Chlorothanonil with Reason or Presidio or Revus or Forum. 

For more information please contact your local county extension agent.

Below is a picture of what to look for in the field.

Avian Influenza

Below is a flyer about preventing avian influenza. Please look at this information if you have backyard flocks or pass along to people you know who have them. Also if you are a wildlife hunter or watcher be on the look out for the symptoms in wildlife.

Cucurbit Yellow Stunt Disorder Virus

Disease alert from Dr. Dutta, vegetable pathologist.

Cucurbit yellow stunt disorder virus (CYSDV) has recently been confirmed on cucumber and cantaloupe samples in GA. 

 Symptoms: Initial symptom starts with chlorotic (yellow) spotting, which gradually develops into a distinct interveinal chlorosis (yellowing). The veins of the leaf remain green but the rest of the leaf turns bright yellow giving an appearance as that of a nutrient deficient leaf.  As disease progresses, the leaves may roll upward and become brittle. Entire plant remain stunted. Fruit set can be severely affected. 

 Transmission: The virus is transmitted by Whitefly vector, Bemisia tabaci in a semi-persistent manner.

cysdv_cantaloupe cysdv_cucumber