Brown Rot: Brown rot pressure remains very high. Make sure to alternate fungicide chemistries or FRAC groups. See page 179 of the Tree Fruit Production Guide for the most effective products and Table 7.7 on page 154 for a summary of fungicide efficacy and FRAC groupings reprinted below:
| Chemistry
(FRAC) |
Fungicide
or Bactericide
|
Bacterial
Spot |
Brown Rot | Leaf
Curl |
Peach
Scab |
Rhizopus
Rot |
Rusty
Spot |
|
| Blossom Blight | Fruit Rot | |||||||
| BIORATIONAL | Serenade MAX 14.6WP1 | – | – | – | – | – | – | +++ |
| (NC) | Arimicarb 100 85SP1,
Kaligreen 82SP1 |
|||||||
| INORGANIC COPPER (M1) | Copper, fixed | +++ | – | – | ++ | – | – | – |
| INORGANIC SULFUR (M2) | Sulfur | – | ++ | ++ | + | +++ | – | ++ |
| DITHIOCARBAMATE | Ferbam 76WDG | – | ++ | – | ++++ | – | – | – |
| (M3) | Thiram 75WDG | – | ++ | – | – | ++ | – | – |
| Ziram 76DF | – | ++ | ++ | ++++ | ++ | – | – | |
| PHTHALIMIDE (M4) | Captan 80WDG | – | ++ | +++ | + | +++ | + | – |
| CHLORONITRILE (M5) | Bravo Weather Stik 6F | – | ++ | – | ++++ | +++ | – | – |
| MBC (1) | Topsin M WSB | – | ++++ | ++++ | + | +++ | – | + |
| DICARBOXIMIDE (2) | Rovral 4F, Meteor 4F | – | ++++ | – | – | – | – | + |
| DMI (3) | Indar 2F | – | ++++ | ++++ | – | + | – | ++ |
| Bumper, PropiMax, Tilt | – | +++ | ++++ | – | – | – | ++ | |
| Cevya 3.34SC | – | +++ | ++++ | – | – | – | +++ | |
| Orius AQ 1.67F | – | ++++ | ++++ | – | – | +++ | ++ | |
| Quash 50WDG | – | +++ | ++++ | – | ++ | – | ++ | |
| Rally 40WSP | – | ++ | +++ | – | – | – | ++++ | |
| Topguard, Rhyme 2.08SC | – | – | ++ | – | – | – | – | |
| DMI + QoI (3 +11) | Quadris Top 2.72SC | – | ++++ | ++++ | – | ++++ | + | +++ |
| AP (9) | Vangard 75WG | – | +++ | – | – | – | – | – |
| SDHI (7) | Fontelis 1.67SC | – | ++++ | +++ | – | ++ | + | ++ |
| Miravis 1.67SC | – | ++ | +++ | – | – | – | – | |
| DMI + AP (3 + 9) | Inspire Super 2.82EW | – | ++++ | +++ | – | +++ | – | +++ |
| DMI + SDHI (3 + 7) | Luna Experience 3.34SC | – | ++++ | +++ | – | + | – | ++ |
| QoI | Abound 2F | – | +++ | +++ | + | +++ | – | ++ |
| (11) | Flint Extra 4.05SC | – | +++ | +++ | +++ | +++ | – | +++ |
| QoI + SDHI | Luna Sensation 4.2SC | – | ++++ | ++++ | – | +++ | – | +++ |
| (11 + 7) | Merivon 4.18SC | – | ++++ | ++++ | – | ++ | +++ | ++ |
| Pristine 38WG | – | ++++ | ++++ | +++ | ++ | – | ++ | |
| AROMATIC (14) | Botran 75WP | – | + | + | – | – | +++ | – |
| HYDROXYANILID (17) | Elevate 50 WDG | – | ++ | ++ | – | – | – | – |
| POLYOXIN (19) | Oso 5%SC | – | – | +++ | – | – | – | – |
| ANTIBIOTIC, | FlameOut 17WP, | +++ | – | – | – | – | – | – |
| TETRACYCLINE | Mycoshield 17WP, | |||||||
| (41) | FireLine 17WP | |||||||
Oriental Fruit Moth: Oriental fruit moth is between generations and populations are low. On average, no treatments are needed for this pest at this time.
San Jose Scale (SJS): Some damage is being seen from 1st generation crawlers in northern county orchards where nymphs are active. Now is the time to treat the nymphal stage if you have problem populations. In southern counties the second generation crawler emergence has begun. Treatments for this generation should be made the first or second week of August in southern counties. High volume applications are required for control since all twigs and surface areas where nymphs are active need to be covered. Esteem, Centaur, Venerate and Diazinon are choices for control.
Apple:
San Jose Scale (SJS): See peach section above.
Brown Marmorated Stink Bugs (BMSB): Adults and nymphs are now moving into orchards from alternate hosts and habitats.
Codling Moth (CM): On average, trap captures are low, but we have seen some continued high pressure in some southern orchards. If you have already treated, and the moth count exceeds 5 males per trap, then an additional insecticide may be needed.:
Summer Diseases: (Reprinted from last newsletter) Rots are now appearing in susceptible varieties. Bitter rot is of most concern but white rot has also been seen in some varieties. Cover sprays with Captan at 3.5#/acre plus a phosphorus acid product (ProPhyte or similar) may help to suppress further rot infections and will improve sooty blotch and fly speck control. For troublesome blocks where bitter rot is a major concern then a tight summer disease program that incorporates Captan + ProPhyte, rotated with Merivon or Luna Sensation may improve control. Ziram (76DF) may be used at the full 6 lb/A rate (14 day PHI), and rotated with the previous suggestions. Ferbam may not be available, and is not recommended due to possible fruit marking this late in the season.
Scouting Calendar Tree Fruit Southern Counties
The following table is intended as an aid for orchard scouting. I t should not be used to time pesticide applications. Median dates for pest events and crop phenology are displayed. These dates are compiled from observations made since 1995 in Gloucester County. Events in northern New Jersey should occur 7-10 days later.
| Pest Event or Growth Stage | Approximate Date | 2021 Observed Date |
| Bud Swell (Redhaven) | March 23 +/- 15 Days | March 29 |
| 1/4″ Green Tip Red Delicious | March 31 +/- 13 Days | March 27 |
| Pink Peach (Redhaven) | April 4 +/- 15 Days | April 4 |
| Tight Cluster Red Delicious | April 9 +/- 13 Days | April 6 |
| Oriental Fruit Moth Biofix | April 9 +/- 13 Days | April 8 |
| Full Bloom Peach (Redhaven) | April 9 +/- 14 Days | April 10 |
| Pink Apple (Red Delicious) | April 14 +/- 12 Days | April 11 |
| Codling Moth Biofix | April 27 +/- 13 Days | May 2 |
| Green Peach Aphid Observed | April 16 +/- 16 Days | April 26 |
| Full Bloom Apple (Red Delicious) | April 22 +/- 11 Days | April 20 |
| Petal Fall (Redhaven) | April 22 +/- 10 Days | April 24 |
| Petal Fall (Red Delicious) | April 27 +/- 14 Days | May 7 |
| Shuck Split (Redhaven) | April 30+/- 11 Days | April 29 |
| First PC Oviposition Scars Observed | May 3 +/- 18 Days | April 29 |
| Tufted Apple Bud Moth Biofix | May 4 +/- 10 Days | May 3 |
| San Jose Scale Crawlers | June 2 +/- 8 Days | Not observed |
| White Peach Scale Crawlers | May 26 +/- 11 days | Not observed |
| Pit Hardening Peach | June 16 +/- 8 Days | June 14 |
Tree Fruit Trap Counts – Southern Counties
| Weekending | STLM | TABM-A | CM | BMSB | OFM-A | DWB | OFM-P | TABM-P | LPTB | PTB |
| 4/17/21 | 7 | 0 | 8 | 1 | ||||||
| 4/24/21 | 12 | 0 | 34 | 2 | ||||||
| 5/1/21 | 7 | 0 | 11 | 1 | 0 | 0 | ||||
| 5/8/21 | 9 | 0 | 0 | 7 | 0 | 1 | 3 | 0 | ||
| 5/15/21 | 4 | 2 | 0 | 1 | 1 | 1 | 2 | 7 | ||
| 5/22/21 | 0 | 2 | 1 | 0 | 7 | 0 | 3 | 3 | ||
| 5/29/21 | 0 | 12 | 1 | 0 | 12 | 0 | 5 | 1 | ||
| 6/05/21 | 0 | 5 | 2 | 2 | 30 | 0 | 5 | 20 | ||
| 6/12/21 | 0 | 4 | 2 | 0 | 7 | 1 | 5 | 26 | 0 | |
| 6/19/21 | 0 | 6 | 3 | 4 | 33 | 1 | 8 | 29 | 0 | |
| 6/26/21 | 0 | 2 | 2 | 1 | 34 | 0 | 2 | 18 | 2 | |
| 7/3/21 | 0 | 0 | 0 | 0 | 24 | 0 | 1 | 6 | 1 | |
| 7/10/21 | 0 | 1 | 2 | 0 | 29 | 0 | 1 | 17 | 2 | |
| 7/17/21 | 0 | 0 | 4 | 0 | 2 | 10 | 1 | 0 | 23 | 2 |
| 7/24/21 | 0 | 0 | 6 | 0.25 | 5 | 9 | 1 | 1 | 13 | 6 |
| 7/31/21 | 0 | 0 | 8 | 1.2 | 4 | 7 | 1 | 1 | 12 | 4 |
| 8/6/21 | 3 | 0 | 10 | 0 .8 | 3 | 34 | 0 | 0 | 15 | 7 |
Tree Fruit Trap Counts – Northern Counties
| Week Ending | STLM | TABM-A | CM | BMSB | OFM-A | DWB | OBLR | OFM-P | TABM-P | LPTB | PTB | |
| 4/3/21 |
|
0 | 0 | |||||||||
| 4/10/21 | 0 | 0 | 1.4 | |||||||||
| 4/17/21 | 12 | 0 | 1.6 | 0 | 1.5 | |||||||
| 4/24/21 | 14 | 0 | 9.4 | 0 | 4.4 | 0 | ||||||
| 5/1/21 | 12 | 0 | 0.2 | 21.6 | 0 | 7.7 | 0 | 0 | ||||
| 5/8/21 | 13 | 0.4 | 1.1 | 23.3 | 0 | 10.5 | 0.1 | 0 | ||||
| 5/15/21 | 12 | 0.5 | 0.4 | 12.7 | 0 | 2.7 | 0.6 | 0 | 0 | |||
| 5/22/21 | 15 | 14.3 | 2.1 | 8.0 | 0.2 | 0 | 1.3 | 8.4 | 5.8 | 0 | ||
| 5/29/21 | 3 | 30.8 | 3.1 | 5.3 | 2.1 | 7 | 5.3 | 25.3 | 20.6 | 0.2 | ||
| 6/05/21 | 2 | 27.4 | 0.5 | 6.1 | 1.4 | 0 | 3.2 | 32.7 | 7.2 | 0.5 | ||
| 6/12/21 | 18 | 26.3 | 0.4 | 5.4 | 1.7 | 2.0 | 1.6 | 37.5 | 17.9 | 0.3 | ||
| 6/19/21 | 49 | 70.4 | 1.0 | 3.1 | 2.0 | 4.0 | 5.2 | 79.5 | 10.8 | 0.2 | ||
| 6/26/21 | 64 | 30.9 | 0.5 | 4.3 | 1.4 | 0.5 | 2.9 | 35.3 | 8.1 | 0.2 | ||
| 7/03/21 | 113 | 20.6 | 0.2 | 4.6 | 4.2 | 0.5 | 1.7 | 18.1 | 7.7 | 0 | ||
| 7/10/21 | 74 | 8.2 | 0.3 | 3.0 | 3.1 | 0 | 0.9 | 7.4 | 1.9 | 0.4 | ||
| 7/16/21 | 35 | 2.2 | 0.3 | 4.4 | 1.6 | 0.0 | 1.1 | 2.1 | 6.6 | 1.3 | ||
| 7/31/21 | 67 | 2.3 | 1.0 | 1.6 | 1.9 | 6.8 | 0.5 | 1.3 | 1.0 | 0.9 | 1.0 | |
| 8/6/21 | 40 | 2.5 | 0.7 | 0.8 | 2.4 | 4.5 | 0.0 | 0.9 | 3.2 | 1.2 | 2.0 |
Grapes:
Grape Root Borer: This is a sporadic pest in NJ, and no activity has been seen so far this year. Therefore, in most vineyards there are no known grape root borer problems, and no treatments are needed at this time.
Spotted Lanternfly (SLF): SLF adults are moving into vineyards statewide, and populations vary greatly depending on location .While there are no known treatment thresholds, we do know that the adults can be much more problematic than the nymphs, and it is likely that adult populations will only increase from now through the end of the season. Some researchers feel that the presence of 5 or more adults per vine will merit control. As the insects start to move into the vineyards, numbers can change quickly. Make sure to look at edge rows first, since this is primarily an edge pest.
| Grape traps – Southern to central counties | ||
| Week Ending | GBM | GRB Bucket |
| 5/29/2021 | 2 | 0 |
| 6/5/2021 | 0 | 0 |
| 6/12/2021 | 2 | 0 |
| 6/19/2021 | 1 | 0 |
| 6/26/2021 | 0 | 0 |
| 7/3021 | 0 | 0 |
| 7/10/2021 | 4 | 0 |
| 7/17/2021 | 4 | 14 |
| 7/24/2021 | 7 | 16 |
| 7/31/2021 | 0 | 12 |
Blueberries:
General: All fruit has been harvested. Therefore we are only concerned with post-harvest pest issues. These include 1) Spray timing for 2nd generation sharpnosed leafhopper, 2) Treating any fields that had or have putnam scale populations – timing for crawler activity, and 3) Post harvest applications of fungicides for black shadow control.
Putnam Scale: Crawler traps have been placed in fields where known populations of Putnam scale were present during June. Crawler activity will dictate the timing for the second generation treatments in the near future.
Sharpnosed Leafhopper: Insecticides are timed for the second generation of adults, since these are the primary motile forms and spread the bulk of blueberry stunt disease. Traps are being monitored, but counts are low. This indicates that few second generation adults have matured, and sprays are not needed at this time.
Black Shadow: On a average throughout both Atlantic and Burlington County we are finding black shadow presence on 26% of canes per bush and a high of 98% of canes per bush. Those growers with significant black shadow on their bushes may wish to follow recommendations published earlier by Dr. Peter Oudemans. For more information please see earlier articles on black shadow:
https://njaes.rutgers.edu/blueberry-bulletin/pdfs/2020/bb-v36n23.pdf
https://njaes.rutgers.edu/blueberry-bulletin/pdfs/2021/bb-v37n01.pdf
