Gypsophila Diseases
Gary W. Moorman, Professor of Plant Pathology
| Disease | Symptoms | Pathogen/Cause | Management |
|---|---|---|---|
| ALTERNARIA FLOWER BLIGHT | Flowers turn black. | Alternaria | Apply iprodione, mancozeb or maneb + zinc. |
| BOTRYTIS BLIGHT | Bud scales and stems turn ash-gray and stems die. | Botrytis cinerea | Space plants to insure good air circulation. Maintain low humidity. Avoid watering late in the day. Remove crop debris. Apply iprodione or mancozeb. |
| PHYTOPHTHORA CROWN ROT | Plants wilt. Stems at the soil level have a wet rot. Plants die and are easily pulled up. | Phytophthora parasitica | Plant in pasteurized soil. Apply mefenoxam, etridiazole, potassium salts of phosphorus acid, or etridiazole + thiophanate methyl to protect healthy plants. |
| PYTHIUM ROOT AND STEM ROT | A wet rot develops at the base of young plants. Leaves yellow, wilt and die. | Pythium spp. | Plant in pasteurized soil. Do not overwater or overfertilize plants. Apply mefenoxam etridiazole, potassium salts of phosphorus acid, or etridiazole + thiophanate methyl to protect healthy plants. |
| RHIZOCTONIA STEM ROT | Stems rot at the soil level, split longitudinally and have a dry, shredded appearance but are not easily pulled out. | Rhizoctonia solani | Plant in pasteurized raised beds. Apply PCNB, thiophanate methyl or iprodione as a soil drench to protect healthy plants. |
Active Ingredients and Trade Names of the Chemicals
| FRAC Group no. | Risk Level | Class | Active Ingredient | REI Restricted Entry Interval | Trade names (EPA Reg. no.) |
|---|---|---|---|---|---|
| 1 | 3 | Benzimidazole | thiophanate methyl | 12 | 3336 (1001-69), OHP 6672 (51036-329-59807), Fungo Flo (51036-329-59807), Systec 1998 (48234-12) |
| 2 | 3 | Dicarboximide | iprodione | 12 | Chipco 26GT (100-1138), Chipco 26019 (264-481), Iprodione (51036-361), Sextant, (51036-361-59807) |
| 4 | 3 | Acylanine | mefenoxam | 0 | Subdue MAXX (100-796) |
| 14 | 1 | Aromatic | |||
| hydrocarbon | PCNB | 12 | Revere (400-407-10404), Blocker (5481-211), Terraclor (400-399), Defend (5481-444-1001) | ||
| Thiadiazole | etridiazole | 12 | Truban (58185-7), Terrazole (400-416) | ||
| M | 1 | Dithiocarbamate | mancozeb | 24 | Dithane (707-180), FORE (707-87), Pentathlon (1818-251) |
| manganese + zinc | 24 | Protect T/O (1001-65) | |||
| Combined products | 1 | ||||
| 1 + M | thiophanate methyl + etridiazole | Banrot (58185-10) |
Fungicides and Fungicide Resistance Management - Certain fungicides, usually systemic fungicides, are said to be 'at risk' to the development of resistance if they are used repeatedly. See the Risk Level in the above table (1 = low risk; 3 = high risk). The Fungicide Resistance Action Committee has developed a numbering system in which chemicals with the same FRAC Group number have the same mode of action (See http://www.frac.info/frac/index.htm ). It is recommended that chemicals at high risk be used sparingly and in rotation or mixed with chemicals with different modes of actions (different FRAC number).
DISCLAIMER
Notice: The user of this information assumes all risks for personal injury or property damage.
Warning! Pesticides are poisonous. Read and follow all directions and safety precautions on labels. Handle carefully and store in original labeled containers out of the reach of children, pets, and livestock. Dispose of empty containers right away, in a safe manner and place. Do not contaminate forage, streams or ponds.
Issued in furtherance of Cooperative Extension work, Acts of Congress, May 8 and June 30, 1914, in cooperation with the U. S. Department of Penn State College of Agricultural Sciences research and extension programs are funded in part by Pennsylvania counties, the Commonwealth of Pennsylvania, and the U.S. Department of Agriculture.
Visit Penn State Extension on the web at extension.psu.edu.
Where trade names appear, no discrimination is intended, and no endorsement by Penn State Cooperative Extension is implied.
This publication is available in alternative media on request.
The Pennsylvania State University is committed to the policy that all persons shall have equal access to programs, facilities, admission, and employment without regard to personal characteristics not related to ability, performance, or qualifications as determined by University policy or by state or federal authorities. It is the policy of the University to maintain an academic and work environment free of discrimination, including harassment. The Pennsylvania State University prohibits discrimination and harassment against any person because of age, ancestry, color, disability or handicap, national origin, race, religious creed, sex, sexual orientation, gender identity, or veteran status. Discrimination or harassment against faculty, staff, or students will not be tolerated at The Pennsylvania State University. Direct all inquiries regarding the nondiscrimination policy to the Affirmative Action Director, The Pennsylvania State University, 328 Boucke Building, University Park, PA 16802-5901; Tel 814-865-4700/V, 814-863-1150/TTY.
