Mr. Clarence Codod (Grad Student) has been scouting 18 commercial vegetable fields in Tift, Colquitt and Worth counties for whitefly and viral diseases. Here are some of the important details from our Spring scouting (Apr 7- Apr 21) Whitefly adults are more prevalent and occur in higher numbers in brassica (broccoli and cabbage)…
Downy mildew has been detected on cucumber in Echols County today by Mr. Justin Shealey. These observations indicate that inoculum of downy mildew is currently in southern GA counties and under favorable conditions potential disease outbreak in cucurbit crops can occur. I would suggest our cucurbit growers to look for the downy mildew symptoms in their fields and start applying protective spray of below stated…
By Clint Thompson Vidalia onion producers have begun harvesting the early maturing varieties this year, and Chris Tyson is excited about the potential of this year’s crop. “The Vidalia onion crop definitely looks favorable this year. We are anticipating a quality harvest,” said Tyson, University of Georgia Cooperative Extension area…
We have confirmed Downy Mildew of onion in the area. Thanks to the keen eyes of our growers, and fast confirmation from our county agents (Jason Edenfield and Derrick Bowen), Downy Mildew of Onion has been positively confirmed in our area. Please protect your crop as necessary.
Just as a reminder, these are the products we are recommending for downy control:
Product Efficacy Rating
Omega 500 moderate
*Note about Omega: We believe Omega has better “curative” activity, and would be the better option if you have downy present in your fields. The Omega 500 label also specifically says “DO NOT use an adjuvant with Omega 500F on this crop.”
Orondis Ultra moderate
*Note about Orondis Ultra: The label specifically states, “For ground or aerial applications, a spreading/penetrating type of adjuvant such as a non-ionic surfactant, organosilicone, or blend must be added at labeled agricultural use rates
Bravo moderate to low
Zampro moderate to low
Phosphites low (but can help)
What does this mean for our crop?
We still have a ways to go on some onions. Onions that are more than 10 days from digging should take precedence for treatment. If onions are within a week or two of digging, a decision to treat is a judgement call that you will have to make on a case by case basis.
The weather conditions over the next few days are calling for highs in the 80’s, with no rain forecasted until next week (unless you get some rain today). This type of weather is typically not as favorable for downy mildew spread, but please don’t let this stop you from protecting your crop. We still have a long way to go on many onions, and it can definitely continue to spread. Pictures of the infected plants from this morning are included.
Research conducted by Hajihassani nematology group showed that drench and in-furrow applications of nematicide Velum Prime cause phytotoxicity to cucumber at transplanting (see photo). In contrast, Velum Prime had no phytotoxic damage to cucumber when applied though drip irrigation at transplanting. We recommend to use Velum Prime at least 3…
Determine the nematode genus (type) and their number in soil by analyzing the soil samples at a Nematode Diagnostic laboratory. For root-knot nematodes, the damage threshold is 0nly 1 nematode per 100 cc of soil. The nematicide rate for nematode control may vary based upon the nematode pressure in the…
A newly registered insecticide, PQZ, from Nichino America has shown good efficacy against the adult stage of silverleaf whitefly in multiple small plot tests in the last few weeks. While overall efficacy has not been fully evaluated, the activity on adults has appeared equal to Sivanto, which has been considered…