Rutgers Cooperative Extension
Peach:
Oriental Fruit Moth: We are between generations 1 and 2, with the first insecticide applications having been just applied in southern counties, and in northern counties due by the weekend. The second application will be due the following week. See timings below: [Read more…]
*The NJDOH partnered with the NJDA and the NJDOL to create this guidance for agricultural employers focusing on precautions to help protect farm employees from COVID-19 on New Jersey farms and in farm labor housing. This webinar reviews these guidelines.
By Peter Oudemans
June 4-6 and June 12 showed some significant downy mildew infection periods and we are now beginning to see the effects. Since berries are susceptible until about a month after capfall this is something we need to be concerned about. The question is how to handle this now?
Rules:
There are consistently high infection potentials this week for boxwood blight.
Protective fungicide applications should remain in effect or be initiated immediately.
| Boxwood Blight Risk Model | ||||
| Date | Upper Deerfield (NJ50) | Howell (NJ10) | Pequest (NJ58) | |
| 6/20/20 | S | Low risk | Very low risk | Infection potential |
| 6/21/20 | Sun | Low risk | Infection potential | Infection potential |
| 6/22/20 | M | Infection potential | Infection potential | Infection potential |
| 6/23/20 | T | Infection potential | Infection potential | High Inf. potential |
| 6/24/20 | W | High Inf. potential | High Inf. potential | High Inf. potential |
| 6/25/20 | Th | Infection potential | Infection potential | Low risk |
| 6/26/20 | F | Very low risk | Very low risk | Low risk |
| — | — | — | — | — |
| ^Risk of infection^ | ||||
| adapted from: uspest.org/risk/boxwood_app | ||||
The weather: Don’t let these beautiful early summer days fool you, we all know that violent thunderstorms can appear out of nowhere, bringing with them high winds and rain (wind driven rain) causing high persistent humidity. I.e. the perfect storm for fungal pathogens to spread and successfully infect. Accordingly, many other fungal pathogens are equally active under these conditions and should be managed accordingly. Prevention is always easier than a cure.
These advisories are general in nature so someone from your business should be using this risk model if boxwood is important to your financial stability. In 30 seconds you can have a better idea of boxwood blight (and other pathogen) activity in your immediate area!
Boxwood blight information:
The disease may be sporulating and spreading amongst plantings if present (or may come into your nursery or landscapes via shipments) within the next few days. The pathogen, Calonectria pseudonaviculata, (aka Cylindrocladium buxicola) can also infect other hosts within the boxwood family (Buxaceae). These include common landscape plants such as Pachysandra and Sweetbox, so treatments should be directed towards these hosts as well. Leaf-litter suspected of boxwood blight should only be removed carefully under dry conditions (i.e. do not use a leaf blower to remove leaf-litter in Pachysandra or Boxwood plantings this week!). Additionally, please refrain from touching the plants at all during wet conditions as boxwood blight spores are sticky and can be transferred from plant-to-plant or site-to-site. Please follow proper sanitization and sterilization practices in addition to a preventative spray program. Tools, clothing, and transportation equipment should be routinely cleaned with alcohol or bleach to prevent the spread of this disease. Additionally, this pathogen forms small (yet bomb-proof) survival structures (Microsclerotia) that can remain as a source of infections for 7-10 years within the soil and leaf-litter (part of why you do not want to use a leaf blower to clean out leaf-litter!).
See the following for what to do in multiple boxwood blight scenarios.
Boxwood blight key symptoms:
Look-a-likes: NOT ALL FOLIAR DISEASES are Boxwood blight:
Fungicides;
ROTATE between Fungicide Resistance Action Committee (FRAC codes)
Format: [FRAC code]: Chemical name (Trade names)
Always refer to the label for allowable host crops, use-restrictions, application rates, reapplication intervals, re-entry intervals (REI), and mix compatibility information.
DISCLAIMER: Production and pesticide information on this site are for commercial operators only and are NOT for home gardener use. Provided materials represent examples and do not cover all possible control scenarios. Please contact your local agent or chemical sales representative for more information.
Previous Boxwood Blight Plant and Pest Advisory Posts;
Additional resources on boxwood blight;
Contact: Timothy J. Waller, Ph.D. (twaller@njaes.rutgers.edu)
Based on our degree-day (DD) model for Sparganothis fruitworm, flight initiation and first eggs laid events are expected at around 596 and 681 DD, respectively (see chart). As of June 18, Sparganothis has accumulated 661 DD (using April 15 as biofix; a biofix more realistic to New Jersey practices). Based on the April 15 biofix, flight has been initiated and eggs should start to be laid soon. However, we do not expect peak flight and those eggs to start hatching until the end of next week. Larval injury to fruit usually begins after the eggs hatch. If treatment is required (based on pheromone trap counts), sprays should be done 10-14 days after peak moth captures, ca. 7-11 July. If Sparganothis pressure has been high, it may be advisable to treat 3 weeks after the moth flight began (i.e., around 1-4 July) and again 10 days later. When bees are present your option is to use an insect growth regulator such as Confirm or Intrepid. Our “standard” recommendation has been, however, to wait until bees are removed to apply an insecticide. Your post-bloom options include Diazinon, Altacor, Delegate, Exirel, or Intrepid. Timing of insecticide application is critical; so, if needed, do not wait too long to manage this pest. I will continue to provide weekly updates to see if these estimated dates change as the season progresses.
Sparganothis fruitworm degree-day model
Topic: 2020 Cranberry Growers Twilight Meeting
Host: Cesar Rodriguez-Saona <CRodriguez@RCE.Rutgers.edu>
Webex Host: Patricia D. Hastings
Date: Tuesday, June 23, 2020
Time: 5:45 pm, Eastern Daylight Time (New York, GMT-04:00)
Session number: Not Available
Registration password: Please obtain your session password from your host.
Agenda
5:45-6:00 PM Verification ID for registrants getting pesticide credits
6:00-6:20 PM “2020 Weed Management Updates for New Jersey Cranberries”
Dr. Thierry Besancon, Assistant Extension Specialist, Weed Science
6:20-6:35 PM “Cranberry Hybrids: their Nutrition and Crop Potential”
Dr. Nicholi Vorsa, Professor and Director, Rutgers P.E, Marucci Center
Dr. Jennifer Johnson-Cicalese, Research Associate
6:35-6:55 PM “Scouting and Managing Summer Diseases in Cranberry”
Dr. Peter Oudemans, Professor Blueberry/Cranberry Pathology
6:55-7:10 PM “Non-fungal Diseases of Cranberry”
Dr. James Polashock, Research Plant Pathologist, USDA-ARS
7:10-7:30 PM “2020 Cranberry Insect Pest Management – An Update”
Dr. Cesar Rodriguez-Saona, Extension Specialist, Entomology
7:30-8:00 PM “2020 Revisions to the New Jersey Pesticide Regulations”
Patricia Hastings, Pesticide Safety Education Program Coordinator, Rutgers NJAES
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To register for this session
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Go to https://rutgers.webex.com/rutgers/k2/j.php?MTID=t30838a4d3eac637397cb4b8b935d6418 and register.
Once the host approves your registration, you will receive a confirmation email with instructions for joining the session.
Note: If you have already registered for this session, you do not need to register again.
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For assistance
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You can contact Patricia D. Hastings at:
hastings@njaes.rutgers.edu
1-848-932-0176
https://www.webex.com
