- Author: Ben Faber
It's that time of year to see some drama in avocado orchards. Once healthy-looking trees can suddenly turn brown in a weekend and all the surrounding trees still look fine. And it can be quite common in some years along the coast. The winter weather will have mild, cool even rainy days and then suddenly there's one of those 97 deg days and the tree goes down,
The entire tree or only one or several branches wilt suddenly when affected by Verticillium wilt. Leaves turn brown and die, but the dead leaves usually remain on the tree for several months. Brown to gray-brown streaks are visible in the xylem of the branches or roots when the bark is removed....
Help for the Home Gardener from the Contra Costa Master Gardener Help Desk
Client's Problem and Questions:
Client called (early September) and left a phone message that the her community garden colleague's tomatoes, although now 4 feet tall, set some fruit, but that the plant had suddenly started to turn yellow and appears that the plants won't surive. CCMG Help Desk responded with both a phone call and an email.
CCMG Help Desk Response:
As I mentioned in the phone message that I left for you this morning, the information in your phone message about the tomato problem your community garden colleague has experienced...
- Author: Mark Bolda
- Author: Monise Sheehan
This is simply a summary of one year of biological fungicide work in strawberries in 2012-2013 and should not be understood as a recommendation to use any of these products. This investigation is will continue into 2013-2014 and will serve to confirm and adjust the work here.
Introduction: A number of biological fungicides registered for use in strawberries have not been thoroughly tested through empirical studies to give guidance to growers on their efficacy and use.
Materials and Methods:
Table 1 below is an outline of materials tested in 2012-2013.
The field involved in the study was organically farmed and had a tested infestation of Verticillium...
- Author: Mark Bolda
- Author: Steven Koike
Marchitez de verticillium sigue siendo uno de problemas causados por patógenos del suelo de fresas cultivadas en California más potentes. Históricamente, Verticillium fue la meta principal a donde se dirigió actividades de mitigación de patógenos del suelo, en otras palabras fumigación de pre-plantar, evitación, rotación del cultivo y mejoramiento de resistencia en variedades de fresa.
Síntomas de marchitez de Verticillium: Síntomas iniciales constan de achicamiento de planta, desarrollo demorado y el amarillento de las hojas. Tal como progrese la enfermedad las hojas más maduras marchitan, resecan y...
- Author: Mark Bolda
- Author: Steven Koike
Verticillium wilt continues to be one of the most potentially damaging diseases caused by soilborne pathogens in strawberries grown in California. Historically Verticillium was the primary target against which soil pathogen mitigation, i.e. pre-plant soil fumigation, avoidance and crop rotation, and breeding for plant resistance, in strawberries was been directed.
Verticillium wilt symptoms: Early symptoms consist of stunting, delayed development, and the yellowing of lower leaves. As disease progresses the older leaves wilt, dry up, and become brown; typically the younger, central leaves of the plant remain green until the plant dies and all foliage turns brown (Figure 1). In contrast to...