Posts Tagged: fumigant
CDPR Seminar: Transition from Methyl Bromide to Alternatives in Strawberry
Pretty short notice here, but UCCE's own Steve Fennimore is giving a seminar on the transition from methyl bromide to alternative pre-plant treatments in strawberry. It will be conveniently webcast, see the information on the flier below.
I'm tuning in for sure, I want to hear from a researcher who actually has spent a lot of time with this stuff in the trenches.
Steve Fennimore Methyl Bromide Alternative Seminar.
Soil fumigation research for California specialty crops - what have we learned?
Since beginning the California phase of my career eight years ago (first with USDA-ARS...
Outreach on methyl bromide alternatives for the Pacific West region
One of my research focus areas over the past few years has been related to soil fumigation issues,...
2012 MBAO PAW Outreach poster Hanson
soil fumigation extension Hanson UCD
Methyl iodide (Midas) registration to be suspended in US market
I just read about an interesting development in the methyl iodide (Midas) controversy - the...
Avoiding fumigant injury to strawberry plants
The combination of 1,3 dichloropropene (1,3-D)and cholorpicrin is a popular choice for fumigating strawberry fields after methyl bromide. It is very effective and convenient to administer through the drip irrigation system. However, 1,3-D can result in phytotoxicity if transplanting takes place before the fumigant completely dissipates.
Phytotoxicity from 1,3-D
Symptoms of phytotoxicity from 1,3-D include yellowing of leaves purple coloration and stunted plant growth. Newly emerged leaves will look normal and plants appear to recover to some extent, but subsequent growth and yield potential can be affected.
![Strawberry plants (variety Albion) about 85 days after transplanting. Stunted plant growth, discoloration of the foliage with purple tinge indicated injury from 1,3-D. Transplanting took place 16 days after fumigation. (Photos by Surendra Dara) Strawberry plants (variety Albion) about 85 days after transplanting. Stunted plant growth, discoloration of the foliage with purple tinge indicated injury from 1,3-D. Transplanting took place 16 days after fumigation. (Photos by Surendra Dara)](http://ucanr.edu/blogs/strawberries-vegetables/blogfiles/10280.jpg)
Strawberry plants (variety Albion) about 85 days after transplanting (above and below). Stunted plant growth, discoloration of the foliage with purple tinge indicated injury from 1,3-D. Transplanting took place 16 days after fumigation. (Photos by Surendra Dara)
![Strawberry plants (variety Albion) about 85 days after transplanting. Stunted plant growth, discoloration of the foliage with purple tinge indicated injury from 1,3-D. Transplanting took place 16 days after fumigation. (Photos by Surendra Dara) Strawberry plants (variety Albion) about 85 days after transplanting. Stunted plant growth, discoloration of the foliage with purple tinge indicated injury from 1,3-D. Transplanting took place 16 days after fumigation. (Photos by Surendra Dara)](http://ucanr.edu/blogs/strawberries-vegetables/blogfiles/10281.jpg)
![Purple coloration on older leaves can still be seen even up to 110 days after transplanting as a result of 1,3-D injury (Photo by Surendra Dara) Purple coloration on older leaves can still be seen even up to 110 days after transplanting as a result of 1,3-D injury (Photo by Surendra Dara)](http://ucanr.edu/blogs/strawberries-vegetables/blogfiles/10282.jpg)
Purple coloration on older leaves can still be seen even up to 110 days after transplanting as a result of 1,3-D injury (Photo by Surendra Dara)
![A typical plant from 1,3-D injured field 110 days after transplanting (left) is smaller than a typical plant from a neighboring field which was transplanted about 3 weeks later and not subjected to 1,3-D injury (right) (Photos by Surendra Dara) A typical plant from 1,3-D injured field 110 days after transplanting (left) is smaller than a typical plant from a neighboring field which was transplanted about 3 weeks later and not subjected to 1,3-D injury (right) (Photos by Surendra Dara)](http://ucanr.edu/blogs/strawberries-vegetables/blogfiles/10283.jpg)
A typical plant from 1,3-D injured field 110 days after transplanting (left) is smaller than a typical plant from a neighboring field which was transplanted about 3 weeks later and not subjected to 1,3-D injury (right) (Photos by Surendra Dara)
Avoiding fumigant injury
Proper planting interval after fumigation is very important to avoid phytotoxicity and subsequent crop losses. It usually takes two or more weeks for the fumigant to dissipate depending on the type of soil, method of application, plastic mulch, and soil temperature and moisture conditions. Use of virtually impermeable film (VIF) or totally impermeable film (VIF) increase the effectiveness of fumigation, but retain the fumigant for a longer period in the soil requiring additional time before planting. Chloropicrin and 1,3-D usually are ideal for dryer soils and require longer planting interval in moist soils. In drip fumigation, adequate amount of water to apply fumigants is important. Excessive water can dilute the fumigant concentration and reduce its effectiveness. Insufficient water limits the distribution and may increase the volatilization of the fumigant and thus reduces its effectiveness. A minimum of three weeks of plant-back time is recommended for drip applied 1,3-D products. It is important to refer to the product label for proper fumigation procedures and planting interval. A healthy start is essential for the season long performance of the strawberry plant and realizing the maximum yield potential.
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References
2008. IPM for strawberries. UCANR publication 3351.
Santos, B. M. 2007. Life after methyl bromide: research on 1,3-dichloropropene plus chloropicrin in Florida. University of Florida Cooperative Extension Service publication HS1119.