Organic Farm Advisory

The Plant & Pest Advisory serves NJ growers by reporting on important pests and recommending responses that are grounded in reproducible trials.

Articles in this section contain information helpful to the NJ commercial organic grower.

Sharing organic practice trial results between land-grant universities is a cost effective way to create a common knowledge base built on the strengths of individual programs. In the sidebar, find institutions with programs in organic agriculture which augment knowledge developed at the Rutgers New Jersey Ag Experiment Station.

Rutgers Cooperative Extension Field Guides: These concise guides help with decision making from pre-planting to harvest. For each crop listed, learn what pests to proactively look for as the season progresses, how to look for them, and when to take action.

Field Guide List

Marketing Tip: Consider Pre-Bagging Produce at Farm Markets

By, Michelle Infante-Casella and Meredith Melendez, Agricultural Agents

Farm marketers can learn from recent behaviors observed in supermarkets and other food outlets as we start the produce season in New Jersey. Besides facilitating social distancing and having employees and customers wear masks and other protective gear, farm owners and workers can help ease shopping anxiety by pre-bagging items.Person grabbing an orange from a bag with a glove

To date there is no scientific evidence to support the transmission of COVID-19 through food, but customer buying patterns have shown that packaged produce is selling better than loose produce. Customers are fearful of virus transmission from many different sources regardless of the science. Most people are very suspicious when touching every object around them whether it be door handles, shopping carts, checkout counters, credit card machines and also on the list – loose fruits and vegetables on shelves that may have been handled by other people. These fears are certainly understandable.

Some food stores are reporting bagged items are selling faster than loose items. The public sentiment is wrapped produce has a barrier that acts as a safety measure against contamination. Produce items in pre-packaged containers, such as bagged lettuces, bagged broccoli, bagged cucumbers, bagged peppers, packaged tomatoes and other items wrapped in plastic have increased in sales over their unpackaged counterparts. In addition, items in highest demand tend to be more shelf-stable produce like potatoes, apples, onions, unpeeled carrots, winter squashes and cabbage.

The media has been publicizing milk dumping from tanker trucks, in-season produce fields being plowed, and issues with food distribution across the country due to issues from COVID-19. Consumers are questioning many issues right now. Is the U.S. food supply safe? Will there be enough food to go around? Will the food stores be closing? Is it safe to buy fresh produce? Should I worry when I see empty store shelves?

To ensure a domestic food supply in the future, it is more important than ever for customers to buy local and US farm products. This is a message the entire agriculture industry can share with the public.

Some questions about food and COVID-19 can be answered by reading the U.S. Food & Drug Administration’s website https://www.fda.gov/food. This is also a good site to send your customers to help answer their questions. Resources specific for the agricultural community are listed on the Rutgers On-Farm Food Safety COVID-19 website.

In summary, farm market proprietors may want to keep produce displays well stocked with plenty of bagged and packaged produce items. This will also help facilitate having customers in the market for shorter periods. Customers can just pick up bags and go rather than pick through a pile and taking extra time to bag their own items. In addition, pricing bags ahead of time, that don’t need to be weighed, can also quicken check out times. Shoppers are in a hurry to get in and out of stores to ease fears of potential virus transmission. Making it as easy as possible to help facilitate shopping and check out may go a long way to lessen customer anxiety in current times. Keep engaged with customers for suggestions on what they may need from your market.

Farmers and farm markets will be playing a major role in food distribution and food security in the near future and beyond. Thank you to all farmers, farm workers, and other essential workers in this time of crisis.

Allium leaf miner update: 04/09/20

Allium Leaf Miner

Allium leaf miner (ALM) adults were captured in higher numbers (16/week) on yellow cards in Princeton (Mercer Co.), NJ on Tuesday of this week, while lower numbers (2) were found near Milford, Hunterdon County.  Additionally, a garlic field near Asbury on the Warren/Hunterdon border was found to have 64% of plants exhibiting feeding/egglaying scars.  This indicates that the first (spring) flight of these flies is now in full swing, and damage is ongoing.  ALM flies were observed on foliage in all fields that were inspected this week.

Oviposition scars on onion

Photo: Sabrina Tirpak. Allium leafminer oviposition scars on onion

Growers should consider implementing the control method of their choice at this time.  Affected crops include chives, scallions, garlic, onions and leeks.

Floating row covers, kept on until this flight ends will help minimize access to plants.  Insecticide applications targeting adults may be helpful as well, although frequency of applications is uncertain.  Spinosyn materials (Radiant, Entrust (OMRI approved)), pyrethroids (Mustang Maxx, Warrior),  neonicotinoids (Scorpion, Venom) and the insect growth regulator Trigard are labeled for miner control.  The diamide, Exirel, is permitted in NJ under a 2ee label as well.

Adult activity and observations of feeding will be reported on in the IPM Update as they occur.  At this time, all growers should respond to the first adult generation.  We will attempt to identify the end of the first flight so that growers know when the risk of infestation has abated.

 

 

 

Seed Corn Maggots in the Fields Early this Spring

Even though most people are focused on the pandemic, life on the farm still goes on. That also means, plant pests and crop production will be business as usual during the growing season. With the mild winter and earlier than usual warm springtime temperatures, many insect pests we often see in spring are emerging earlier than usual. One that has already been detected in Southern New Jersey is the seed corn maggot. This pest is about 2-3 weeks ahead of schedule in our region.

Seed Corn Maggots

Eggs, larvae, pupae and adult flies of the Seed Corn Maggot, photo credit Cornell University

Seed corn maggot adult flies have been seen in Gloucester County this past week. As vegetable farmers begin planting crops affected by seed corn maggot (snap beans, lima beans, corn, turnips, peas, cabbage, and cucurbits – mainly squash and cucumber), it is important to use insecticidal seed treatments to protect these crops. Adult flies are most likely in other areas of New Jersey right now. Cool to moderate temperatures and wet weather increase activity and survivability of this early season pest. When adult maggots lay eggs near the planting hole, eggs can hatch in just a few days after being laid. Maggots then can burrow into seeds or seedlings, feed for a period of 2 to 3 weeks and then develop into egg-laying adults. There can be many generations per year, but activity is heightened during periods of cool and wet weather.

Adult flies are most abundant in fields with cover crops, soils with high organic matter, fields where leaves have been applied, fields that have just been tilled, or in fields that have had manure applied. When a seed or seedling is attacked, it may continue to grow, but will be weak and not produce a crop. Preventative control methods are most effective, since once larvae are found causing damage in the field, they are difficult to control underground. Some commercial insecticide seed treatments are available and to find products for individual crops see the 2020-2021 Mid-Atlantic Commercial Vegetable Production Recommendations guide. This information can be downloaded free at https://njaes.rutgers.edu/pubs/publication.php?pid=E001 .

Other preventative methods include row covers to create a barrier between the insect pest and the seeds or seedlings, waiting to plant in fields until soils and air temperatures are warm enough to quicken germination and plant growth, and selecting fields for early plantings with low organic matter and that do not remain wet for long periods.

Later in the season, even though this pest may be present, most crops can germinate and grow fast enough to overcome low numbers of larvae present in the field. When warmer temperatures and drier conditions occur seed corn maggot populations generally decrease.

Allium leaf miner update: 03/24/20

Allium Leaf Miner

Allium leaf miner (ALM) feeding/egglaying scars were detected in chives near Princeton (Mercer Co.), NJ on Tuesday of this week.  This indicates that the first (spring) flight of these flies has now begun and damage will increase.  Additionally, extension personnel at Penn State have reported finding the first feeding scars in several southeastern PA sites within the past few days.  It is believed that all of these occurrences are very recent.

Allium leafminer oviposition scars on onion

Photo: Sabrina Tirpak. Allium leafminer oviposition scars on onion

Growers should consider initiating the control method of their choice at this time.  Affected crops include chives, scallions, garlic, onions and leeks.

Floating row covers, kept on until this flight ends will help minimize access to plants.  Insecticide applications targeting adults may be helpful as well, although frequency of applications is uncertain.  Spinosyn materials (Radiant, Entrust (OMRI approved)), pyrethroids (Mustang Maxx, Warrior),  neonicotinoids (Scorpion, Venom) and the insect growth regulator Trigard are labeled for miner control.

Adult activity and observations of feeding will be reported on in the IPM Update as they occur.  At this time, all growers should respond to the first adult generation.  We will attempt to identify the end of the first flight so that growers know when the risk of infestation has abated.

 

 

 

Status of U.S. Consular Operations in Mexico in Light of COVID-19

In response to the global pandemic COVID-19, and in line with the Mexican government’s call to increase social distancing, the U.S. Embassy in Mexico City and all U.S. consulates in Mexico will suspend routine immigrant and nonimmigrant visa services starting March 18, 2020, and until further notice. For farmers this means, H-2A workers and others from Mexico may be prevented from entering the U.S. until further notice. NJ Farm Bureau is researching the subject for more clarification. For now to see more information go to the U.S. Embassy’s website at: Field of plantershttps://mx.usembassy.gov/status-of-u-s-consular-operations-in-mexico-in-light-of-covid-19/

Phytophthora-tolerant and -resistant bell pepper variety trial reports

Phytophthora blight caused by Phytophthora capsici is one of the most economically important diseases in pepper, tomato, and cucurbit production in New Jersey. Each year for the past few decades Rutgers has evaluated new bell pepper cultivars and breeding lines for their resistance to P. capsici in field trials at the Rutgers Agricultural Research and Extension Center (RAREC) near Bridgeton, New Jersey, and in some years at research trials on farms near Vineland, NJ. The pathogen, an oomycete – ‘water mold’ is favored by warm weather and wet soils during the production season and can survive between seasons in the soil as oospores. Once found in a field, the pathogen can establish itself, and be very difficult to control even with the use of fungicides. Fortunately, in bell pepper, phytophthora blight resistant/tolerant cultivars have been commercially-available for over 20 years now and have been used extensively by bell pepper growers throughout the state. Each year, as mentioned above, Rutgers evaluates these bell peppers for their resistance to P. capsici in heavily-infested fields as well as evaluate each for their fruit quality characteristics (e.g., color, wall thickness, number of lobes, and development of ‘silvering’). Some important points to remember. The pathogen is consistently evolving because of its sexual activity (i.e., mating types and oospore production). The more researchers look into the pathogen’s genetic diversity, the more they seem to find. The pathogen can develop resistance to important fungicides. Insensitivity to mefenoxam and copper resistance have been know for a very long time. Finally, phytophthora resistant cultivars such as Paladin which have been used extensively in southern New Jersey for the past 20 years appear to be breaking down. Over the past few years a number of new phytophthora resistant/tolerant bell peppers with new sources of genetic resistance have been released and evaluated by Rutgers. Some of these new bell peppers also have varying levels of resistance to bacterial leaf spot, with one – ‘Playmaker’ having X10R resistance to bacterial leaf spot and tolerance to P. capsici. Because of the increased reports of bacterial leaf spot and copper resistance in recent years and the difficulty in controlling it alone, all bell peppers grown in NJ at some point will need to have to have X10R resistance and phytophthora blight resistance. Importantly, for organic bell pepper growers, if you have not already done so, you should be evaluating these new lines to see if they meet your needs. The easiest way to mitigate both diseases are to start with genetic resistance. Below are the bell pepper variety reports going back to 2005 for review.

For more information on recommended bell pepper cultivars please visit the Pepper Section in the 2020/2021 Mid-Atlantic Commercial Vegetable Productions Recommendations Guide.

Pepper Tolerance 2005

Pepper Tolerance 2006

Pepper Tolerance 2007

Pepper Tolerance 2008

Pepper Tolerance 2009

Pepper Tolerance 2010

Pepper Tolerance 2011

Pepper Tolerance 2012

Pepper Tolerance 2013

Pepper Tolerance 2014

Pepper Tolerance 2015

Pepper Tolerance 2016

By: Andy Wyenandt and Wesley Kline