|
|
How to Manage Pests
UC Pest Management Guidelines
Nectarine
Jacket Rot
Pathogen: Botrytis cinerea,
Sclerotinia sclerotiorum, Monilinia laxa, and Monilinia fructicola
(Reviewed 6/06,
updated 6/06)
In this Guideline:
|
|
|
Jacket rot occurs during the jacket stage when remnants of the
flower parts are still attached to the fruit. The disease causes a brown
discoloration on the fruit under the jacket. The young fruit withers and falls
off the tree within a few weeks.
Development of jacket rot is favored by wet weather during the bloom
and jacket stage.
MANAGEMENT
One fungicide application at full bloom is generally effective.
Fungicides applied during the jacket stage are generally ineffective. Treat at full
bloom or shortly thereafter but before petal fall.
The final bloom spray for blossom brown rot often provides jacket rot control
if the appropriate fungicides (iprodione, thiophanate-methyl,
pyraclostrobin/boscalid, cyprodinil, etc.) are chosen.
| Common name |
Amount/Acre |
P.H.I.+ |
| (trade name) |
|
(days) |
|
| The following materials are listed in
order of usefulness in an IPM program, taking into account efficacy. When
choosing a pesticide, also consider information relating to environmental
impact.
|
| |
| A. |
IPRODIONE |
| |
(Rovral) 4 |
1–2 pt |
|
| |
MODE
OF ACTION: A dicarboximide (Group 2)1 fungicide.
|
| |
COMMENTS: Addition of a narrow range oil
(superior, supreme) at 1–2% increases the effectiveness of this material. Do not use after petal fall. |
| |
| B. |
THIOPHANATE METHYL |
| |
(Topsin-M) 70 WP |
1.5 lb |
1 |
| |
MODE OF ACTION: A MBC (Group 1)1
thiophanate fungicide.
|
| |
COMMENTS: Apply thiophanate methyl in combination with another fungicide of different chemistry. |
| |
| C. |
PYRACLOSTROBIN/BOSCALID |
| |
(Pristine) |
10.5–14.5 oz |
0 |
| |
MODE OF ACTION: A Qol (Group 11)1
and carboxamide (Group 7)1 fungicide. |
| |
COMMENTS: To reduce the potential for the
development of resistance, do not make more than five applications/season of Group 7 or 11 fungicides. |
| |
| D. |
CYPRODINIL |
| |
(Vangard) 75WG |
5–10 oz |
2 |
| |
MODE OF ACTION: An AP (Group 9)1
fungicide.
|
| |
| E. |
FENHEXAMID |
| |
(Elevate) 50WDG |
1–1.5 lb |
0 |
| |
MODE OF ACTION: A hydroxyanilide (Group 17)
1 fungicide.
|
| |
COMMENTS: Do not apply more than 6
lb/acre/season and avoid making more than 2 consecutive applications with this material. |
| |
| F. |
DICHLORAN |
| |
(Botran) 75W |
1.33–5.33 lb |
10 |
| |
MODE OF ACTION: An AH (Group 14)1
fungicide.
|
| |
| G. |
CHLOROTHALONIL |
| |
(Echo 720) |
3.125–4.125 pt |
|
| |
(Bravo Ultrex) |
2.8–3.8 lb |
|
| |
(Bravo Weather Stik) |
3.125–4.125 pt |
|
| |
MODE OF ACTION: A multi-site contact (Group
M5)1 chloronitrile fungicide.
|
| |
COMMENTS: May cause an allergic skin
reaction in some people. Do not use with or closely following oil sprays. Do
not apply after jacket (shuck) split. Do not apply more than 20.5 pt Bravo
Weather Stik/acre/season. Do not apply more than 18.8 lb Bravo Ultrex/acre/season. |
| |
| H. |
CAPTAN 50 WP |
5 lb |
|
| |
MODE OF ACTION: A multi-site contact (Group
M4)1 phthalimide fungicide.
|
| |
COMMENTS: Do not apply in combination with,
immediately before, or closely following oil sprays. Do not apply after 75% petal fall. |
| |
| |
|
![[Precautions]](/IMAGES/btn-precautions_bul.gif)
![[UC Peer Reviewed]](/IMAGES/logo-ucpeerreviewed.jpg)
UC IPM Pest Management Guidelines: Nectarine
UC ANR Publication 3451
Diseases
W. D. Gubler, Plant Pathology, UC Davis
J. E. Adaskaveg, Plant Pathology, UC Riverside
Acknowledgment for contributions to the diseases section:
B. L. Teviotdale, Kearney Agricultural Center, Parlier
Top of page
|
