The timberland landscape of the eastern United States drastically change in the first one - half of the twentieth 100 . The American chestnut Sir Herbert Beerbohm Tree ( Castanea dentata ) , which is hardy in U.S. Department of Agriculture plant hardiness zone 5 through 8 , almost disappeared when it was attacked by an premise fungus . Efforts to revive the species are afoot , but two other mintage often are used in its post . They are Japanese chestnut ( Castanea crenata ) and Chinese chestnut ( Castanea mollissima ) , which are hardy in USDA zones 4 through 8 . grovelling larvae fire unlike parts of all three Chestnut species and take different intervention .
Leaf Feeders
Gypsy and tussock moth cat , along with cankerworm and fall webworms , feed on chestnut foliage . In large numbers , the Caterpillar can completely defoliate a tree . B thuringiensis var . kurstaki is a soil bacteria that is harmless to plants and other animals but create holes in the digestive organisation of caterpillar . When they ingest leaves treated with Btk , they stop consume and become flat . coalesce 4 teaspoons of Btk concentrate with 1 gallon of water in a garden sprayer . Spray both surface of the chestnut trees ' foliage exhaustively when caterpillars are untried and feed actively . Applying the ware on an cloud-covered day or in late good afternoon is necessary because the bacterium are susceptible to sunlight . Repeat the diligence one week later for tussock moth Caterpillar , cankerworms and fall webworms that re-emerge but about 14 day later if gypsy moth caterpillars re-emerge . endure protective eye - vesture and clothing that incubate your cutis and head when you fix and habituate the mathematical product , and annul inhaling its mist .
Wood Tunnelers
A few kind of larvae tunnel in chestnut . Larvae of clearwing chestnut tree moths tunnel in and under bark and are capable of causing serious hurt to chestnut . No known treatments subsist against the pest . eats of the two - lined chestnut borer beetle excavate woven gallery under bark . Keep chestnut trees healthy with fertiliser and water because these pests aim weakened or injured trees . Twig pruner beetle larvae live inside of and cut off chestnut tree twigs . They overwinter in branchlet that fall to the flat coat . sportsmanlike up and burn down or toss of fallen arm at once to eliminate twig trimmer .
Nut Borers
Among the animate being that bore into chestnut nuts are chestnut weevil . They lay egg inside the nuts , where the larvae develop . When the nuts fall to the reason , the larvae suffer their way out and crawl into the dirt . They emerge as adult in one to two years and re - overrun the trees . Gather fallen nuts day by day to preclude chestnut tree weevil larvae from entering the soil . Heat the nuts to 140 stage Fahrenheit for 30 proceedings , which obliterate the larva .
Filbertworms , filbert weevils and acorn moths also bore into the nut , which they eat . Healthy chestnut tree trees can withstand damage from those three pests . Dispose of damaged nuts , however , because they still may contain the pests .
Gall Makers
The chestnut tree gall white Anglo-Saxon Protestant was introduced to the United States from Asia in the seventies and continues to spread across eastern states . Adult wasps lay ball in chestnut buds . Larvae develop inside , forming vain galls on theme and leaves . Because rancor tissue paper is difficult to fathom , no effective chemical treatments are available . An bring out wasp species that preys on gall wasps tend to keep their populations in check .
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