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The fall webworm (Hyphantria cunea) is a moth in the family Erebidae known principally for its larval stage, which creates the characteristic webbed nests on the tree limbs of a wide variety of hardwoods in the late summer and fall. It is considered a pest but does not harm otherwise healthy trees.
Changing the orientation of their leaves in different directions (parallel or perpendicular) allows plants to reduce damage from intense light. Leaves also wilt in response to stress, because it changes the angle at which the sun hits the leaf. Leaf rolling also minimizes how much of the leaf area is exposed to the sun. [2]
Hyphantria is a genus of tiger moths in the family Erebidae. The genus was erected by Thaddeus William Harris in 1841. [1] The moths are primarily found in North and Central America. One species, Hyphantria cunea, was introduced in Eurasia.
Chouioia cunea Yang, 1989 Chouioia is a genus of endo parasitic wasp of the family Eulophidae . Chouioia cunea is considered an important parasite of the fall webworm in China, where the moth is an invasive species.
In systematic virus infections leaf spots caused by viruses show a loss of green colour in leaves, due to chlorosis which is a repression of chlorophyll development. [1] Leaves may yellow and have a mottled green or yellow appearance, show mosaic (e.g. chlorotic spotting) and ringspots (chlorotic or necrotic rings). [7]
Leaf miner damage to a horse chestnut tree Leaf with minor miner damage Tomato with leaf miner damage Leaf mines by the moth Phyllocnistis hyperpersea on a Persea borbonia leaf Leaf miner trail on a fallen leaf in a Gondwana cool temperate rainforest. Note the initial thin width of the insect trail, becoming wider as the insect grows while it ...
Peach leaf curl is a plant disease characterized by distortion and coloration of leaves and is caused by the fungus Taphrina deformans, [1] which infects peach, nectarine, and almond trees. T. deformans is found in the United States , Europe , Asia , Africa , Australia , and New Zealand . [ 2 ]
Most commonly Cephaleuros virescens is identified by the leaf spots it causes. Theses leaf spots are an orange-brown rust in color and usually occur entirely on the upper leaf surface, although leaf spots on the undersides of infected leaves have been reported. The spots are fuzzy in texture and approximately 2 cm (0.8 in) in diameter. [2]