May 8, 2020

NJ Department of Agriculture Issues Burn Permit for Frost Protection – Thru May 11

New Jersey Department of Agriculture has issued a notice concerning open burning due to colder spring overnight temperatures presently forecasted for areas of New Jersey from Thursday, May 7 through Monday, May 11, 2020, which could adversely affect fruit, vegetable, and floriculture crops in bloom or near bloom around the state. For details read below the links.

Note: The NJDEP and New Jersey Forest Fire Service caution all farmers and agriculture businesses with respect to the use of open burning in high wind velocity conditions. Please take note that farmers are encouraged to utilize smudge pots is warming as necessary during higher wind conditions. Use of open burning when wind velocity is greater than 5mph is strictly prohibited, may contribute to wildfire risk, and can carry significant penalties. [Read more…]

Filed Under: Blueberry, Cranberry, Fruit, Nursery, Strawberry, Tree Fruit, Vegetable Crops, Wine Grape Tagged With: , , , , , ,
April 21, 2020

Recognizing cold injury in spring crops

If the erratic, wet weather wasn’t enough, temperatures have fluctuated wildly this spring with night time temperatures dropping to near freezing in some parts of the state and region in recent days. With this comes the potential for cold injury on spring planted crops. Cold injury can take may different shapes on affected plants and developing fruit.

In some cases, sympoms may show up on the newest growth as a result of non-lethal injury to meristematic tissue, in pepper and tomato, new growth may be distorted with misshapen leaves. In some cases, new leaves may have a mottled, or mosaic look much like a plant infected with a mosaic virus. In these instances, plants will grow out of the problem.

In cucumber, symptoms on maturing fruit appear as brownish-tan areas on the epidermis of fruit. The fruit will also show cracking as if it has a dry rot. The effects are physiological where areas of young developing fruit got chilled by the cold night time temperatures.

We have collected a few images below of cold injury from crops from this spring.

Cuke_cold injury

Cold injury on cucumber fruit. The initial damage was done a few weeks ago while the fruit was very young.

 

 

 

 

 

 

 

Cold injury on young cucumber plant (Photo: M. Casella)

 

 

 

 

 

 

 

Cold injury on young cauliflower plant (photo: K. Holmstrom)

 

 

 

 

 

 

 

 

 

 

Frost damage in strawberry (photo: T. Besancon)

 

 

 

 

 

 

 

 

 

 

Cold injury on sweet corn under low tunnel. (photo: M. Casella)

 

 

 

 

 

 

 

 

 

 

Cold injury on cucumber seedling (photo: M. Casella)

 

 

 

 

 

 

 

 

 

 

Cold injury in emerging asparagus spear (photo: Rick VanVranken)

 

 

 

 

 

 

 

Freezing of young potato plant (photo: Rick VanVranken)

 

 

 

 

 

 

 

Cold injury on snap bean. (photo: Jack Rabin)

Freeze damage caused by ice crystal formation in veins of snap bean (photo: Jack Rabin)

Filed Under: Vegetable Crops Tagged With: , , ,
April 6, 2020

Spear Damage in Asparagus

Spear damage in asparagus can be caused by diseases such as Phytophthora spear and crown rot and purple spot. However, other environmental factors during the spring can damage spears as they emerge from the soil.

Freeze injury in asparagus

Fig 1a. Freeze injury in asparagus. (Photo by Tom Orton)

Freeze injury in Asparagus

Fig 1b. Freeze injury in Asparagus. Note the color of the interior of the spear. (Photo by Tom Orton)

 Freeze Injury – About 10 days ago temperatures dipped well below freezing for a night or two, and combined with the higher than normal temperature this spring, some asparagus fields that had already started to produce spears were hit with injury. Affected spears will be bent/distorted and begin to breakdown and rot (Fig. 1a).

Cutting frozen spears will show the discoloration of the spear caused by the freeze (Fig. 1b).

Fig. 2. Wind damage of asparagus spears. Notice how all spears are pointed in the same direction

 Wind – Periods of heavy winds during emergence will cause spears to bend.Winds can cause one side of the spear to dry out quicker than the other causing the spear to bend and point in the direction of the prevailing wind. An asparagus planting is suffering from wind damage if most of the bent spear heads in the bed are pointing in the same direction (Fig.2).

[Read more…]

Filed Under: Vegetable Crops Tagged With: , , ,
April 26, 2016

Insect Management with Low Fruit Load

After the critically cold temperatures in early April followed by several other nights of below freezing temperatures, NJ peach and apple growers have experienced loss of blossoms and/or fruit set. While the extent of the injury may still be too early to tell for some varieties, the cold weather has not stopped insect pests and where no fruit will be harvested we need to adjust our approach to insect management. This provides an opportunity to use selective materials where possible and allow natural enemy populations to attack some key pests.

IMG_0379

Terminal flagging from Oriental fruit moth egg laying

Oriental Fruit Moth lays its eggs of at least the first and second generation in peach terminals. Due to low or absent fruit loads, the trees will be very flush and provide lots of oviposition sites. Injury to terminals is noticeable by “flagging” of the terminals. If unmanaged, populations will be high in 2017 and could be difficult to control. Thus management of at least the first and second generation OFM needs to occur. I would strongly recommend using mating disruption, such as OFM TT, for unharvestable orchards. This will control all 4 generations and significantly reduce OFM pressure next year without harming beneficial insects. Mating disruption dispensers are placed in the middle of the tree canopy and can be placed now. See label for rate information. Sprayable mating disruption such as Checkmate OFM-F can be applied at 1.32 – 2.93 oz/A applied just prior to adult flight and again during flight. For chemical options, we generally use 5-6 male moths in a trap as a trigger for management. If monitoring traps exceed 5-6, then the use of either Madex HP or a diamide chemistry (ie. Altacor) is recommended. Madex HP is an insect virus that only attacks OFM and codling moth and is very effective in both research and commercial trials in NJ at rates from 1.5 – 3.0 oz/acre. Both Madex and the diamides will have minimal impact on natural enemies but have good control of OFM and should be applied at diamide timing according to the DD model (see NJ Tree Fruit Production Guide or PPA posts from IPM scouting). Codling moth and OFM in apple will likely not require management but should still be monitored. [Read more…]

Filed Under: Tree Fruit Tagged With: ,