Archives for May 2013

May 17, 2013

Corn Herbicides and Soil Insecticide Interactions

by Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

A number of corn herbicides have label precautions about use of an organo-phosphate insecticide at planting due to potential crop injury. This includes the insecticides Counter (terbufos), Lorsban (chlorpyrifos), and Fortress (chlorethoxyfos). The herbicides include both soil-applied and postemergence herbicides. Some of the common products include Callisto (Halex GT); Resolve (Steadfast, Basis); Accent; or Capreno. Many of the Group 2 (or ALS-inhibiting herbicides) have these precautions. The list of herbicides can be found at http://extension.udel.edu/ag/files/2012/08/CornWeedguide.pdf and go to Table 19. [Read more…]

Filed Under: Commercial Ag Updates
May 17, 2013

Burndown for No-Till Soybeans at this Time

by Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

If no-till soybean fields have not been sprayed yet, we are facing an uphill battle. Most of the horseweed (or maretail) is now well over 6” tall, and so are a lot of the other winter annual weeds. [Read more…]

Filed Under: Commercial Ag Updates
May 17, 2013

Vegetable Disease Update – 5/17/13

This past week there were a few reported cases of bacteria causing problems in tomato transplants, along with an isolated case of pith necrosis from the field as well as bacteria causing issues in strawberry.  There have been no reports of late blight or cucurbit downy mildew in the region to date. [Read more…]

Filed Under: Vegetable Crops Tagged With: , ,
May 17, 2013

Tomato Disease Forecasting Report 5-17-13

5-17-13 Tomato Report – Click to Download

Disease severity values (DSVs) for early blight, septoria leaf spot, and tomato anthracnose development are determined daily based on leaf wetness (due to rainfall, dew) and air temperature.

On a daily basis DSV values can range from 0 to 4 where 0 = no chance for disease development to 4 = high chance for disease development.
DSVs are accumulated during the production season.

Fungicide applications are based on an individually determined DSV threshold. The first fungicide application for the control of these three diseases is not warranted until 35 DSVs have accumulated from your transplanting date. After that, growers can base fungicide applications on different DSV thresholds.

Filed Under: Disease Forecasting
May 17, 2013

Potato Disease Forecasting Report 5-17-13

Potato Disease Forecasting Report 5-17-13 – Click to Download

Welcome to the new potato report for 2013! As always, we will be tracking DSVs for Late blight development and calculating P-days for initiating the first early blight fungicide application. Remember the threshold for P-days is 300! Once 300 P-days is reached for your location early blight fungicide applications should be initiated.

Filed Under: Disease Forecasting
May 15, 2013

Cranberry Growers Twilight Meeting

Date: Wednesday, June 5, 2013
Location: Pine Island Cranberry

Meeting Agenda
5:30: Dinner

6:30-7:00: Peter Oudemans,
Troubleshooting Cranberry Disease Problems

7:00-7:30: Cesar Rodrigues-Saona,
Identifying and Controlling Cranberry Insects

7:30-8:00: Pat Hastings,
Safety Precautions in Cranberry Pest Control

8:30-9:00: Dave Frank,
Current Status of Local Bee Populations & Controlling Bee Diseases

9:00-9:30: Ray Samulis,
Farm Safety and the AgrAbility Program

Filed Under: Cranberry