The " worms " that most often appear on birch trees are not true worm ; they are larvae . Bagworm larvae are grim ; two other insects , the Birch Leaf Miner and the Bronze Birch Leaf Borer , produce slender livid larvae that look like worms . Those larvae feed on birch parting .

Bagworms

The bark and foliage of your birch Sir Herbert Beerbohm Tree may stop little bags hold the eggs of bagworms , Thyridopteryx ephemeraeformis , a extremity of the moth family . Black larvae emerge from the dish and descend on silk strings seek for a host industrial plant . The malarkey sometimes blow the larvae away . When they find a host , they form their own bagful and begin feed in on the crown of leave-taking , causing small browned spots . They poke their heads out to eat then withdraw into their bags , close down them tightly .

Treating Bagworms

you’re able to polish off the bags of bagworms by paw or use insecticides in the early spring . The extension center of Ohio State University recommends insecticides curb the active element acephane , bendiocarb , bifenthrin , carbaryl , chlorpyrifos , cyfluthrin , diazinon , dimethoate , fluvalinate , malathion , nicotine sulfate , pyrethrum , perethrin , rotenone and trichlorfon .

For an constituent option , apply the bacterial spray containing Bacillus thuringiensis , a soil - borne bacteria that occurs naturally in the stomachs of certain moth and butterflies .

Birch Leaf Miner

The Birch Leaf Miner , Fenusa pusilla , is related to ants , bees and WASP . In April , the adults get set ball on developing leaves . The eggs hatch and flat , gray or bloodless larvae , about a one-half column inch long and resembling tiny worms or caterpillars , begin eat on the leaves , causing ugly brown splodge . They spin silken webs that they use to descend to the ground , or they but fall to the basis . They form pupa on the ground and adults emerge two weeks later and the cps continue .

Treating Birch Leaf Miner

Horticulturalists at the University of Delaware recommend spray when the leafage are half expanded and again in late June if legal injury is unusually high . They recommend insect powder containing the active factor acephate , azadirachtin carbaryl , dimethoate , disulfoton and malathion .

Bronze Birch Leaf Borer

The grownup Bronze Birch Leaf Borer , Agrilus anxius , is a svelte beetle with a metal - coppery appearance . The mature larvae are white , segmented , legless grubs about a half inch long . These insect - like larvae feed on the tissue just below the bark that ship nutrients from the canopy to the roots . The starved roots rise more easy and are ineffective to function ordinarily . begin at the upper crest , the tree begins to die .

Treating Birch Leaf Borer

Researchers at the University of Minnesota recommend treating Bronze Birch Borer with insecticides containing the fighting ingredients bendiocarb , chlorpyrifos , dicrotophos and permethrin . utilise in belated May and in mid and late June .

References

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