Archives for May 2017

May 8, 2017

Early-season Insect Pests to Look For in Cranberry Bogs

The following insect pests bear special mention for early-season scouting in cranberry bogs:

Blackheaded fireworm larva

Blackheaded fireworm – Blackheaded fireworm eggs overwinter on the bed and usually hatch by around mid-May. It is important to catch the first generation, if possible, because the second generation occurs during bloom and is typically much more destructive. Blackheaded fireworm larvae can be detected by sweep net sampling and it is a good idea to look along the edges of beds where vines first begin to grow. Remember: blackheaded fireworm is much easier to control if detected during the early part of the season.

Spotted fireworm – overwinters as a 2nd instar larva. They complete two generations a year. Larvae feed between uprights they have webbed together. First-generation larvae injure the foliage causing it to turn brown as if burned. In New Jersey, first generation adult moths emerge the first week of June, followed by a second-generation of adult emergence in early August. Eggs are laid in masses on weedy hosts. Larvae from second-generation adults emerge in mid-August, and may feed on fruit. Populations of spotted fireworm are regulated by their natural enemies, in particular Trichogramma wasps that parasitize the eggs.

Spotted fireworm larva

Sparganothis fruitworm – This insect is a serious pest in most cranberry-growing states.  Sparganothis fruitworm completes two generations a year and overwinters as an early-instar larva. Larvae from the 1st generation feed on foliage. In New Jersey, first generation adult moths emerge from mid-June through the first weeks in July; pheromone traps are commonly used to monitor adult flight and population size. Second-generation eggs are laid on cranberry leaves, and larvae will feed on fruit.

Cranberry blossomworm – Adults lay their eggs in October in cranberry beds. The eggs overwinter and hatch over a period of several weeks. Early instars can be found during the first week of May. Larvae go through 6 instars to complete development. Because the first instars feed during the day (and also at night), scouting can be done during the daytime using sweep nets to estimate larval abundance. Larvae turn nocturnal during the later instars. At this time, night sweeping (9 pm – 1 am) is recommended for sampling. Larvae complete their development by June-July. Older instars are very voracious and capable of destroying 100 blossoms within a 3-week period. There is a pre-pupal that lasts until the end of August and a pupal stage that lasts until October. Adults emerge from end of August to end of October.  

Sparganothis fruitworm larva

Lepidopteran Pests Monitoring and Control – Use sweep netting for monitoring early lepidopteran pests (pre-bloom). A sweep set consists of 25 sweeps and 1 sweep set is recommended per acre (this may vary depending the size of bogs). The action threshold for false armyworm, blossomworm, other cutworms, and gypsy moth (we use a combined threshold from adding all these caterpillars per sweep) is an average of 4.5 caterpillars in sets of 25 sweeps. For brown and green spanworms is an average of 18 per sweep set. The action threshold for blackheaded fireworm and Sparganothis fruitworm is an average of 1 to 2 per sweep set. We recommend the use of the reduced-risk materials Intrepid, Altacor, or Delegate if populations exceed action thresholds. These are reduced-risk, softer insecticides that are very effective against lepidopteran pests. More information on these (and other) lepidopteran pests will be provided as the season progresses.

Cranberry blossomworm larva

Leafhoppers –There is concern among New Jersey cranberry growers of a potential increase in leafhopper populations because of recent changes in pest management strategies (e.g., adoption of new reduced-risk products and decreased applications of broad-spectrum insecticides). Blunt-nosed leafhopper is of particular concern because they can transmit cranberry false blossom disease. This leafhopper has one generation a year. Adults are found in highest numbers during July, although nymphs or adults may be found from the end of May until October. Eggs are laid in August-September. The eggs overwinter and hatch in May or June. The nymphs go through 5 instars to complete development.

Blunt-nosed leafhopper nymph

Leafhopper Monitoring and Control: Leafhopper nymphs can be sampled using sweep nets (as described above for lepidopteran pests). Nymphs before bloom are small; thus, you may need to freeze the samples (to kill them), and then count the number of nymphs under a microscope or using a magnifying lens. There is no threshold based on sweep net counts, so decisions should be made based by comparing current numbers with prior infestation history and/or incidence of false blossom disease on those beds.

In cases of high numbers of blunt-nosed leafhopper nymphs, we recommend application of a broad-spectrum insecticide, such as Diazinon (no aerial applications allowed) or Lorsban (only pre-bloom applications allowed for Ocean Spray growers). Broad-spectrum insecticides will disrupt biological control particularly the natural enemies (predators and parasitoids) of Sparganothis fruitworm, so their use should be restricted only to areas of high leafhopper populations.

Filed Under: Cranberry, Fruit Tagged With:
May 8, 2017

Difference between a third party audit and the Food Safety Modernization Act (FSMA)

There is continued confusion about the difference between a third party audit and the produce safety rule under FSMA. The biggest difference is one is voluntary (third party audit) and one is government regulation (FSMA). Whether you need a third party audit depends on who is purchasing the produce. Some buyers will require an audit and specify the audit firm. This is mainly related to wholesale growers.

Whether you have a third party audit or not, FSMA applies to operations with produce sales over $25,000 (adjusted for inflation) averaged annually over three years.
Farms may be eligible for a qualified exception and modified requirements (section 112.5 and 112.6). To be eligible the farm must meet two requirements:
1. The farm must have all food sales (including animal feed) averaging less than $500,000 per year adjusted for inflation during the previous three years.
2. The farm’s direct sales to qualified end-user (restaurants, CSA, farmers markets, etc.) that is located in the same state or within 275 miles must exceed sales to all buyers combined during the previous three years.

A farm with the qualified exemption must meet modified requirements, including prominently displaying the name and the complete business address of the farm where the produce was grown either on the label of the produce or at the point of purchase.

Compliance Dates

Farm Size Compliance Dates Water Compliance Dates 1,2 Labeling Dates for Qualified Exemption 3 Compliance Date for Retention of Records to Support Qualified Exemption
>$500,000 1/26/18 1/27/20
$250 – 500K4 1/28/19 1/26/21 1/1/20 1/26/16
$25-250K5 1/27/20 1/26/22 1/1/20 1/26/16

1 Compliance dates for certain aspects of the agricultural water requirements allow an additional two years. Provisions with extended compliance dates include:
 The specific microbiological criteria that apply to agricultural water
 Corrective measures that must be taken if agricultural water does not meet requirements
 The frequency of testing agricultural water
 Records associated with data to support a microbial die-off rate, corrective measures, test results from a public water system, or data used to support alternative die-off rates, criteria, or sampling strategies
2 Guidance published 8/24/16 indicates that a farm has the option of collecting surface water samples over two to four years. For example, a farm that is not small or very small would begin sampling in 2018 and complete the water quality profile in 2020, 2021, or 2022.
3 A farm eligible for a qualified exemption must notify consumers as to the complete business address of the farm where the food is grown, harvested, packed, and held.
4 A farm is a small business if, on a rolling basis, the average annual monetary value of produce sold during the previous 3-year period is greater than $250,000 but no more than $500,000.
5 A farm is a very small business if, on a rolling basis, the average annual monetary value of produce sold during the previous 3-year period is greater than $25,000 but no more than $250,000.

Filed Under: Commercial Ag Updates, Food Safety
May 5, 2017

Controlling a Noxious Weed of Blueberry Plantations

With favorable weather conditions for germination and growth during the last few days, some of the summer weeds have started to emerge, including one of the most troublesome weeds in our blueberry plantations! Field bindweed (Convolvulus arvensis) is an aggressive rhizomatous perennial vine that belongs to the morningglory family. It spreads by seeds and by a deep, extensive root system. Reports indicate that seeds can persist in soil for up to 60 years, and that roots can grow up to 30 feet deep.

Field bindweed identification

Field bindweed trails prostrate along the ground until it comes in contact with other plants or structures. Stems will then rotate in a circular patter until it makes contact with a solid structure (overhead irrigation pipes, trees, blueberry bushes, other weed species, etc.), then it will wrap around the structure as it grows.

Seedlings (picture 1) emerged in spring.  Cotyledons are square to kidney-shaped. Young leaves are alternate, bell-shaped with nearly parallel leaf margins and generally rounded tips. Leaf bases are lobed. No cotyledons are present when young plants emerge directly from the rhizome. When juvenile stems are broken, they exude a milky sap. On mature plants, leaves are arranged opposite along the stem and are arrow shaped. Lobes at the base of the leaf point away from the petiole. Stems are smooth to slightly hairy.

Flowers (picture 2) are present from June to September and are trumpet shaped, pink to white in color. Field bindweed has two leaf bracts that grow from ½ to 1 inch below the flower, and is a key identification characteristic.  Flowering is indeterminate, so flowers will continue to develop along growing stems until first frost

Field bindweed control

Mowing will not help to control field bindweed because the plant is growing prostrate on the ground (Picture 3). Cultivation may help to reduce bindweed growth and control it over the time but has to be repeated at frequent intervals. Once cultivated, it will usually take 2 weeks to the plant to regenerate fully functional above-ground vegetation, meaning that cultivation has to be repeated every 7 to 10 days.  Consistency in cultivating bindweed-infested soils will promote the progressive depletion of carbohydrates stored in the root system by not allowing the plant to move back carbohydrates produced in the leaves to the roots. It is critical that NO timing be missed or be late! One single missed tillage can negate all the effort expended up to that point. Expect to continue the effort for 4 to 6 months! Success may require more time if the effort was not started when carbohydrate reserves in the weed were low at the start of the process.

Herbicides can be used to control field bindweed in nursery or mature plantations as long as NO herbicide is allowed to contact crop green bark, wounded trunk, leaves, or suckers. Applications of glyphosate containing herbicides (like Roundup) are effective as long as the herbicide is applied on plants that are actively growing and have flowers in late spring/early summer and late summer/early fall. Spring or fall applications may be more effective than applications made during mid-summer. Spot‑apply the higher percentage solution on the label of the product you use and thoroughly wet the foliage up to the drip point.

Repeated applications will be necessary, as the root system on this plant can be so immense that insufficient herbicide is absorbed with a single application.  Use repeated applications, but allow the plant to grow and produce flowers before each subsequent application.  More translocated herbicide will be moved to the root system when the plant is flowering than when vegetatively growing.

Filed Under: Blueberry, Fruit, Tree Fruit
May 5, 2017

Soil Temperatures

Soil temperatures have been steadily warming since late March at Hort Farm No. 2 (North Brunswick). Temperatures consistently ran above 50 degree Fahrenheit in early April, and between 50 and 60 degrees from 10 to 27 April. May 1st was the fifth consecutive day of the maximum soil temperature reaching at least 65 degrees. Thus, soil temperatures […]

Filed Under: Landscape, Nursery, & Turf, Turf
May 5, 2017

Soil Temperatures

Soil temperatures have been steadily warming since late March at Hort Farm No. 2 (North Brunswick). Temperatures consistently ran above 50 degree Fahrenheit in early April, and between 50 and 60 degrees from 10 to 27 April. May 1st was the fifth consecutive day of the maximum soil temperature reaching at least 65 degrees. Thus, soil temperatures […]

Filed Under: Landscape, Nursery, & Turf, Turf
May 5, 2017

Soil Temperatures

Soil temperatures have been steadily warming since late March at Hort Farm No. 2 (North Brunswick). Temperatures consistently ran above 50 degree Fahrenheit in early April, and between 50 and 60 degrees from 10 to 27 April. May 1st was the fifth consecutive day of the maximum soil temperature reaching at least 65 degrees. Thus, soil temperatures […]

Filed Under: Landscape, Nursery, & Turf, Turf