Archives for June 2021

June 23, 2021

Vegetable IPM Update 6/23/21

Sweet Corn

European corn borer (ECB) moth catches remain very low, and concentrated primarily in Gloucester County (see map below at right).  Most active infestations now are in pre-tassel stage corn, with whorl corn largely free of feeding as egg laying has declined.  Feeding in scouted pre-tassel stage sweet corn ranges to above 30% in Hunterdon County.

Look for the characteristic “shot-hole” type of feeding (photo  below at right) and consider treating when infested plants exceed 12% in a 50 plant sample.  As plantings proceed to the pre-tassel stage, ECB larvae may be found in emerging tassels (see photo at left).  It is a good idea to treat individual plantings as they move into the full tassel/first silk stage one time.  This eliminates any ECB larvae that have emerged with the tassels as they begin to move down the stalk to re-enter near developing ears.

 

Useful insecticides for this particular application include synthetic pyrethroids (IRAC Grp 3), spinosyns (including OMRI approved Entrust) IRAC Grp 5), and diamides such as Coragen or Vantacor (IRAC Grp 28) or materials such as Besiege which include the active ingredient in Coragen.  Synthetic pyrethroids alone should NOT be used for corn earworm (CEW) protection on silking corn.  Control with these materials is very inconsistent.

The highest nightly trap catches of ECB for the week ending 6/23/21 are as follows:

Downer   2 New Egypt   1
Cinnaminson   1 Old Bridge   1
Medford   1 South Branch   1

[Read more…]

Filed Under: Organic Production, Vegetable Crops
June 23, 2021

Some Key Soft Scale Pests in the Landscape

Soft Scale Species Controls (June & July): Compared to armored scales, the soft scales are relatively easy to suppress with either contact sprays or systemic treatments. Some of the common landscape soft scale species in NJ include calico, Fletcher, Indian wax, cottony maple, cottony camellia, spruce bud, European fruit lecanium, pine tortoise, striped pine, magnolia, & tulip tree. Although large soft scale adult females are more difficult to control, the immature nymphs are often vulnerable to sprays when good coverage is achieved. However, there are some species that have proven to be more challenging to control. Two good examples include the calico scale & Indian wax scale species. Horticultural oil sprays are often recommended to control immature scale nymphs, but sometimes against the calico & Indian wax species the efficacies are less consistent. This blog will first review soft scale management options & then show photographs & discuss the life cycles of the following soft scale species with crawlers emerging during June & July: (1) Indian wax, (2) calico, (3) cottony camellia, (4) spruce bud, & (5) Fletcher.

Drawing of a soft scale feeding on woody bark. All soft scale species suck sap from phloem vascular tissues. (Drawing Credit: John Davidson, University of Maryland)

[Read more…]

Filed Under: Landscape, Nursery, & Turf, Nursery, Plant Diagnostic Lab
June 23, 2021

COVID Delta Variant and NJ Agriculture

As the farming season progresses so does concern for the increased prevalence of the COVID Delta variant in the region.  We asked Don Schaffner, Extension Specialist, about the Delta variant and if we should be concerned about it.  If you or your farm workers are in need of a vaccine please email njfarmvax@njaes.rutgers.edu and an Extension team member will assist you with finding local vaccination locations and/or determine if an on-farm vaccine clinic is possible for your workers.  If you have questions about the vaccine visit the Rutgers On-Farm Food Safety Vaccine Education for Growers website for information in multiple languages.

Meredith Melendez: Are we seeing an increase in cases of the COVID Delta variant in New Jersey or the region?

Don Schaffner: Yes. According to CDC, Region 2 (New Jersey, New York, Puerto Rico, and the Virgin Islands) had only 3.1% of all infections due to the Delta variant for the week ending 5/22/21. This percentage had jumped to 17.7% week for the week ending 6/5/21. There are not further updates at this time.

Also according to the CDC in NJ 3.4% all infections were due to the Delta variant for the week ending 5/22/21. No further New Jersey specific updates are available at this time.

MM: How is the Delta variant different than the COVID cases we saw over the past year?

DS: There are a number of reasons why there is increased concern over the Delta variant. Epidemiological data shows that the variant has increased transmissibility (i.e. it is more easily spread from person to person) than the original strain. Estimates indicate that it is about 60% more transmissible. This means that for every one person infected by the original virus, on average for the same conditions the Delta variant would spread to about 1.6 people.

One of the ways of combating the virus once someone is infected is with monoclonal antibody treatments. There is evidence that the Delta variant is more resistant to this important treatment.

There is also evidence that the Delta virus is not as readily neutralized by post-vaccination sera. Sera contain the antibodies in people that are vaccinated.

MM: Are the Pfizer, Moderna, and J&J vaccines as effective against the Delta variant?

DS: Yes.  The Johnson & Johnson vaccine appears to be about 60% effective against the delta variant. The Pfizer and Moderna vaccines are about 88% effective after the second dose (vs. over 90% for other variants). So while the vaccines are less effective against the Delta variant, it is still much better to be vaccinated than not.

MM: Why should someone get vaccinated now if they haven’t already?

DS: Unvaccinated individuals are vulnerable to all variants of the virus. These variants arise through the natural evolution when the virus replicates inside a sick person. Since the vaccines can stop some people from getting infected, the more people that are vaccinated the better control we will have over these variants and stop new variants from evolving.

 

Filed Under: Commercial Ag Updates, Field, Forage & Livestock, Food Safety, Fruit, Landscape, Nursery, & Turf, Plant Diagnostic Lab, Vegetable Crops
June 23, 2021

Vegetable Disease Update – 6/22/21

  • Cucurbit downy mildew has been reported on cucumber (6/16/21) and cantaloupe (6/22/21) in southern New Jersey. For more information on CDM and its control please click here. To track the progress of CDM please visit the CDM forecasting website.
  • No reports of Late blight in the region. To track the progress of Late blight in the US please click here.
  • Bacterial leaf spot (BLS) has been reported on ‘Paladin’ bell pepper in southern New Jersey which has no resistance to BLS.
  • Rhizoctonia root rot has been found in sugar beet in New Jersey.
  • Northern corn leaf blight has been confirmed in sweet corn in southern New Jersey.
  • Basil downy mildew has been reported from multiple locations in southern New Jersey. All basil growers are encouraged to scout their plantings on a daily basis. For more information on controlling BDM please click here. To follow the progress of BDM in the US please click here.
  • Rhizoctonia and Pythium root rot have been reported in pepper. For a review of identifying and controlling root rots please click here.
  • With the on and off again heavy rains we have been getting, along with warmer weather, all growers should consider applying at-transplanting fungicides for root rot control. Please click here to see these articles.
  • The 2020/2021 Commercial Vegetable Production Recommendations Guide is available for free online! With many county offices running reduced hours or being closed this is the easiest way to obtain the newest recommendations.
  • For a quick review on managing fungicide resistance development using tank mixes and fungicide rotations, and information on FRAC group 4, FRAC group 7, and FRAC group 3 and FRAC group 11 fungicides please click on hyperlinks.
Filed Under: Vegetable Crops
June 22, 2021

Fruit IPM for 6/22/21

Peach:

Oriental Fruit Moth: Growers who have used mating disruption for OFM should continue to focus on PC; GPA; and catfacing insect pests as described below. For those growers using insecticides, the first of 2 applications in northern counties is due this week, and the second of 2 applications in southern counties is due next week. This is particularly important where the moth flight is exceeding the treatment threshold of 8 moths per trap. [Read more…]

Filed Under: Blueberry, Fruit, Tree Fruit, Wine Grape
June 22, 2021

Cucurbit Downy Mildew Alert – Cantaloupe – 6/22/21

Cucurbit downy mildew has been confirmed on cantaloupe in southern New Jersey. This is the first report of CDM on cantaloupe and the second this growing season. CDM was confirmed on cucumber on 6/16/21. All cucumber and cantaloupe growers should scout on a daily basis and initiate a preventative fungicide program. CDM has also been confirmed on cucumber in Ontario, Canada this week. Remember, some CDM isolates fall into Clade I which predominately infect watermelon, pumpkin, and squash, where other CDM isolates in Clade II predominately infect cucumber and cantaloupe.

For more information on CDM, the clades, and CDM control please click here.

Filed Under: Vegetable Crops Tagged With: