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Frequently Asked Questions      
         
         
Problem Characteristics Symptoms Prevention Control
Black Vine Weevils Night feeding, hard shelled insects Edges of leaves notched out Do not plant hostas near Yews Chemical sprays, catch weevils and crush with pliers
Chemical Damage Occurs as hostas are in rapid stage of growth in spring Leaves curl, distorted Do not spray herbicides on a windy day Remove affect plant and replant in new site
Cutworms Night feeding, brown insects Large sections of leaf suddenly gone none Granular insecticides
Drawstring Effect Fast growing leaf center outgrows the margin Leaves develop cupping and distortion Do not over fertilize Cut back the first flush of foliage
Fairy Ring Old established clumps can be affected A perimeter ring of buds in spring Divide fast growing hostas every 5-6 years Dig up clump and replant healthy portions
Foliar Nematodes Microscopic worms that feed on leaves Interveinal areas begin yellowing in mid summer Isolate plants for 1 growing season Soak divisions of infected plants in 120F hot water bath for 15 minutes, isolate plants in containers for 6 months
Heavy Frost Damage Foliage wilts and turns watery below 28F Foliage wilts and turns watery Keep a continuous water spray on plants Cut back foliage of frost damaged plants
Light Frost Damage Late spring when nighttime temps reach 20-32F Light yellow dotting Keep a continuous water spray on plants Cut back foliage if it becomes unsightly
Meltout Affects some white centered cultivars in full sun Centre of leaf lightens, dry and turns brown Grow Susceptible cultivars in protected shaded sites Cut back affect foliage and move to a shadier site
Sea Sprite Disease H. Sieboldii types susceptible Circular yellow dots Clean pruning knives in a 50% bleach solution None, destroy infected plants and remove surrounding soil
Slugs Night feeding prosper with high humidity Small holes in leaves Remove mulches Apply granular bait early in the growing season
Spring Burn Primarily on Sieboldiannas with gold color Small or large brown areas Plant non burning cultivars Grow susceptible cultivars in protected sites
Spritzer Virus Spritzer and Green Fountain susceptible 1/4 to 1/2" concentric yellow circles Carefully examine any plant of Spritzer None, destroy infected plants and remove surrounding soil
X Virus Blue/Green markings on light hostas. Dark Hostas look like they have had bleach spilled on them. Hosta Virus X affects different hosta cultivars in different ways, so it is impossible to give a definitive description of symptoms. The most common visual symptom is blue or green markings on a light colored leaf. These markings usually follow the leaf veins and bleed out into surrounding tissue giving the plant a mottled appearance. The tissue often appears lumpy, puckered, and of different thickness or texture that normally colored tissue.  The best way to prevent Hosta Virus X from infecting your collection is to simply not grow infected plants.   Always avoid strangely spotted or mottled plants you find at nurseries. None, destroy infected plants and remove surrounding soil

 



 
   
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