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  • Alberta Greenhouse Growers Association
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    Original URL path: http://agga.ca/component/mailto/?tmpl=component&template=elegance&link=b64389c24832d78afea7edc5f6eba032745593b9 (2016-04-28)
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  • Geranium Rust Alert
    produces spores continuously which can re infect the same plant or spread to other plants The spores need free water for germination The optimum temperature for spore germination is between 16C to 21C The spores of the fungus germinate and penetrate the leaves through the stomatoe on upper and lower leaf surfaces Eventually the rust establishes itself on the leaves How to recognize the rust infections The symptoms can be confused with odema on geraniums If you look closely the symptoms are different and distinct when compared to oedema On the upper surface of leaves you see light yellow circular or irregular spots with a brown dot in the centre On the underside of leaves one can see distinct brown tan lesions which appear to be raised Under a 10 x magnification one can see these raised spots and if shaken rust colored spores might be seen flying in the air The infections I saw on one cultivar did not appear to have a pattern of concentric rings There could be scattered spots between the veins and they could be on the leaf edges Severely infected leaves become yellow and drop prematurely Infected plants are not marketable Remember the cost of one geranium plant at sales time is over 5 dollars How is the disease spread The fungus spores spread by splashing water It means if you hand water your plants then the chance of disease spread is greatest Air currents workers handling the plants and moving the plants will also spread the spores The spores can re infect new leaf surfaces of the same plant or infect other plants The disease can spread very rapidly especially under optimum temperature and relative humidity conditions What are possible control measures Notify the supplier and insist on a crop inspection The fungus

    Original URL path: http://agga.ca/alerts/66-geranium-rust-alert.html (2016-04-28)
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  • Geranium Rust Alert
    that this rust is autoecious meaning that it completes its life cycle on one host The fungus produces spores continuously which can re infect the same plant or spread to other plants The spores need free water for germination The optimum temperature for spore germination is between 16C to 21C The spores of the fungus germinate and penetrate the leaves through the stomatoe on upper and lower leaf surfaces Eventually the rust establishes itself on the leaves How to recognize the rust infections The symptoms can be confused with odema on geraniums If you look closely the symptoms are different and distinct when compared to oedema On the upper surface of leaves you see light yellow circular or irregular spots with a brown dot in the centre On the underside of leaves one can see distinct brown tan lesions which appear to be raised Under a 10 x magnification one can see these raised spots and if shaken rust colored spores might be seen flying in the air The infections I saw on one cultivar did not appear to have a pattern of concentric rings There could be scattered spots between the veins and they could be on the leaf edges Severely infected leaves become yellow and drop prematurely Infected plants are not marketable Remember the cost of one geranium plant at sales time is over 5 dollars How is the disease spread The fungus spores spread by splashing water It means if you hand water your plants then the chance of disease spread is greatest Air currents workers handling the plants and moving the plants will also spread the spores The spores can re infect new leaf surfaces of the same plant or infect other plants The disease can spread very rapidly especially under optimum temperature and relative humidity

    Original URL path: http://agga.ca/alerts/66-geranium-rust-alert.html?tmpl=component&print=1&layout=default&page= (2016-04-28)
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  • Alberta Greenhouse Growers Association
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    Original URL path: http://agga.ca/component/mailto/?tmpl=component&template=elegance&link=a07965119c61805f4e286690f925c79fc3008717 (2016-04-28)
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  • Geranium Toxicity
    Greenhouse Member Sites Greenhouse Pests Grower Services Grower Supplies Grower Information Structures Buildings Industry Associations Find A Greenhouse Near You Wholesale Business Directory Log In Home Grower Alerts Grower Alerts Geranium Toxicity Print Email March 2007 This is how the symptoms would look like on seed geraniums when the pH was measured at 5 3 and E C at 2 85 millimhos The intriguing question is why some adjacent plants showed no symptoms and a pH of 6 0 and E C of 2 2 millimhos I think this may be due to lime distribution in the growing medium The problem can be corrected by feeding potassium bicarbonate solution 2 3 times Don t mix it with other fertilizers What you see is toxicity of iron and manganese due to an acidic pH Dr M Mirza BACK Prev Next tweet Research Sections Grower Alerts Research Extension Most Popular Join AGGA Awards Scholarships Growing for the Cure Greenhouse Retail Map Locator Green Valley Gardens Profile Archives All Articles Search Grower Alerts 2016 Alberta Greenhouse Growers Association All Rights Reserved Contact Site Map Search This Site Register Home About AGGA Awards Scholarships Growing For The Cure Board of Directors Research Extension Workshops

    Original URL path: http://agga.ca/alerts/54-geranium1.html (2016-04-28)
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  • Greenhouse Tomato Alert
    May 2005 CASE 1 A grower wanted to make his greenhouse parking lot ready for customers He decided to apply 2 4 D to kill weed It was hot day and 2 4 D vapors went into the greenhouse Hundreds of tomato seedlings got damaged Don t apply any herbicide near the greenhouse at this critical time of sale Have a look at these pictures Save them for future reference CASE 2 A grower called in to report that his tomato seedlings after about 10 days of transplanting are showing what he called fiddle heads He has used some manure as a part of growing mix Tomatoes are sensitive to herbicides like picloram which can last in manures and soils for several year Here is a picture for your reference Picture on your right is from a bioassay meaning you take suspected water or growing media and grow established tomato seedlings in there If the levels are as low as 0 1parts per billion within 10 days you can see the damage BACK Prev Next tweet Research Sections Grower Alerts Research Extension Most Popular Join AGGA Awards Scholarships Growing for the Cure Greenhouse Retail Map Locator Green Valley Gardens Profile

    Original URL path: http://agga.ca/alerts/61-tomato2.html (2016-04-28)
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  • Guidelines for Managing Nutrients
    types of coir are available as pre bagged material or bulk and one can make their own bags Bags can be bought pre washed or growers wash them before planting Nutrients are handled differently than other growing media like rockwool or perlite or sawdust The article provides detail information on managing nutrients in coir Click here for the full article member login required BACK Prev Next tweet Research Sections Grower

    Original URL path: http://agga.ca/alerts/79-coir-nutrient-management.html (2016-04-28)
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  • Handling Weather Related Problems
    spring The temperature has been consistently going just below zero and snow was there on May 19th Traditionally Victoria Day weekend is very busy for bedding plant growers and a significant amount of income comes in during this week I talked to many growers and learned that they were way behind in their revenues compared to many good years Besides economic impact of such weather growers must understand and know how to manage plants in cloudy cold clammy conditions There is a danger of plants getting leggy and lanky and spindly growth may take place Due to higher relative humidity dew could easily be formed inside the greenhouse and botrytis gray mold could become devastating I received many phone calls about geranium flowers showing botrytis infections and also pythium root rot So here are few things you can do with the plants so that when good weather returns and customers come back good quality plants greet them not yellow leggy pale looking plants Customers like good green flowering plants with lot of buds on them READ THE FULL ARTICLE member login required Prev Next tweet Research Sections Grower Alerts Research Extension Most Popular Join AGGA Awards Scholarships Growing for the

    Original URL path: http://agga.ca/alerts/77-weather-problems-2009.html (2016-04-28)
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