Archives for May 2014

May 26, 2014

Tomato Disease Forecasting Report 5-27-14

5-27-14 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 25, 2014

Vegetable Disease Briefs 5-25-14

  • Hail damage has been reported in areas of southern New Jersey.
  • Cucurbit downy mildew has been reported on cucumber as far north as Southern Georgia. To track cucurbit downy mildew in the US please visit http://cdm.ipmpipe.org/
  • No late blight has been reported in the region to date and has only been found as far north as central Florida to-date. To track late blight in the US please visit http://usablight.org/
Filed Under: Vegetable Crops
May 25, 2014

Vegetable Disease Update 5-25-14

  • Potato
  • Strawberry
  • Tomato

Potato

Blackleg is caused by Erwinia spp. which also cause ‘soft rots’. The bacteria which lead to the aerial phase of Blackleg are soil-borne (originate from old crop debris) and spread by rainfall, overhead irrigation and wind. [Read more…]

Filed Under: Vegetable Crops
May 25, 2014

Recognizing Angular Leaf Spot in Cucurbits

Angular leaf spot is common in New Jersey and the region. It often shows up during cool, wet weather and isolated rain.

Symptoms of angular leaf spot in cucurbit.

Symptoms of angular leaf spot in cucurbit.

Angular leaf spot of pumpkin. Note the 'shot holes' in the leaf.

Angular leaf spot of pumpkin. Note leaf ‘shot holes’.

Angular leaf spot will first appear as, small water-soaked lesions which will expand until they reach a larger leaf vein resulting in the angular looking symptoms on leaves. Under heavy disease pressure, the bacteria will infect fruit causing small, water-soaked circular spots. In many cases once weather conditions become dry again, infected tissue in leaves will die and fall out leaving the characteristic ‘shot hole’ symptoms. Control of angular leaf spot begins with the application of labeled rates of fixed copper plus mancozeb to help suppress the spread of the disease until hot, dry weather returns.

Filed Under: Vegetable Crops Tagged With:
May 25, 2014

Controlling Phytophthora Blight in Pepper

With the wet weather, conditions for the crown rot phase of Phytophthora blight have increased. Phytophthora blight typically develops in low-lying areas of fields after a heavy rain and can spread quickly throughout the entire field. Planting on a ridge or raised, dome-shaped bed will help provide better soil drainage. [Read more…]

Filed Under: Vegetable Crops Tagged With:
May 24, 2014

Severe Hail in Southern New Jersey

tomato hail

Severe hail damage on pepper transplants.

On Thursday night areas of southern New Jersey were hit with severe hail. A significant amount of damage was done on all crops across a few of counties (Salem, Gloucester, and Cumberland).  [Read more…]

Filed Under: Vegetable Crops Tagged With: