bad , pungent - smelling evergreen plant foliage is usually free of pests , but some cat are adapt to feed on the needles or exfoliation of evergreen shrubs such as raetam ( Juniperus spp . ) and arborvitae ( Thuja spp . ) . The caterpillars are mostly larvae of unlike sort of moth . A cat - like larva belong to a wasp relative scream a sawfly . Caterpillars are easiest to manipulate if you come up them while they are still lowly .
Step 1
Usually you do n’t see the bagworm caterpillar itself . What you discover is the silklike bag , embellish with bits of foliation and bark , that it spins around its body as a shelter . The caterpillar enlarges the purse as it feast during the summer , at last attach the sack to a arm or leaves , where pupation and overwintering occurs . The wingless female never leaves the bag . She contains between 300 and 1,000 eggs , which brood in the spring . A declamatory infestation can defoliate an evergreen plant shrub . Among evergreen bagworm innkeeper are Leyland cypress ( x Cupressocyparis leylandii ) , hardy in U.S. Department of Agriculture flora hardiness zones 5 through 9 , and arborvitae , generally sturdy to USDA zone 4 through 11 . command bagworms by handpicking and destroying the travelling bag before eggs hatch in the spring . Once caterpillars hachure , handle them while they are under 3/4 inch long with B thuringiensis , or B.t .
Step 2
Bacillus Thuringiensis
Bacillus thuringiensis is also in effect against moth cat . Once in the digestive tract , the bacteria bring forth a toxic protein that paralyzes the digestive system , and the cat die from starving . Mix 1 to 2 teaspoons of the insect powder thoroughly with 1 Imperial gallon of water . Spray the solution on all surfaces of the shrub , wet upper and lower needle surfaces and the branches . If alimentation activeness continues due to freshly hatch caterpillars , repeat the lotion at three- to 14 - day intervals .
Juniper Webworm
Juniper webworm larvae are yellow to embrown and have dark head . Young caterpillars burrow inside the juniper leaves . As they get expectant , they eat whole leaves , gain in group and spinning web . calculate for the small , 1/2 - column inch - long Caterpillar , their webbing , and the dark-brown color of damaged leaves . For control , hired hand - pick the larvae , prune off infect branches and destruct them , or cover with B.t . Shrub retem that can be hosts include Formosan juniper bush ( Juniperus chinensis ) , brave in U.S. Department of Agriculture works hardiness zones 3 through 11 , and creeping juniper ( Juniperus horizontalis ) , hardy in USDA zones 3 through 10 .
Step 3
Arborvitae Leaf Miner
The very belittled folio mineworker Caterpillar do n’t know freely on the control surface of the arborvitae . Instead , they tunnel into the leaves , turning the foliage yellow and then browned . If you hold the infested needles up to the light you may see the larva and their eating wastes inside the affected leafage . A number of rude enemy such as leechlike wasp help control leaf mineworker populations . Limit universe spread by prune off and put down infected branches . Some bush arborvitae that might be involve are cultivar of eastern arborvitae ( Thuja occidentalis ) , stout in USDA zones 4 through 7 , and Oriental arborvitae ( Thuja plicata ) , hardy in USDA zones 6 through 11 .
Juniper Sawfly
Orange - colored distaff raetam sawflies ( Monoctenus fulvus ) do n’t have stinger , as do many other wasp family members . rather they have a saw - like ovipositor for laying eggs in the shoot tips of Genista raetam . The larvae look like cat and are grayish - green with an orangish head . They eat chiefly the tips of juniper shoots , resulting in a thinned appearance and a impermanent slowdown of new growth . Juniper sawflies eat on a identification number of juniper species , include easterly red cedar ( Juniperus virginiana ) , hardy in USDA zones 2 through 9 . you could launder sawfly larvae off evergreen plant with a strong spray of water . A number of raw enemies help keep sawfly population in check .
References
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