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Viburnum lesquereuxii leaf with insect damage; Dakota Sandstone (Cretaceous) of Ellsworth County, Kansas. Scale bar is 10 mm. Knowledge of herbivory in geological time comes from three sources: fossilized plants, which may preserve evidence of defense (such as spines) or herbivory-related damage; the observation of plant debris in fossilised animal feces; and the structure of herbivore mouthparts.
Bark beetles often attack trees that are already weakened by disease, overcrowding, conspecific beetles, or physical damage. In defense, healthier trees may produce sap, resin or latex, which often contains a number of insecticidal and fungicidal compounds that can kill, injure, or immobilize attacking insects. Sap is one of the first lines of ...
The timber is used for plywood, light construction, pulp and paper, boxes and crates, dug-out canoes, and furniture components. Kadamba yields a pulp of satisfactory brightness and performance as a hand sheet. The wood can be easily impregnated with synthetic resins to increase its density and compressive strength. The wood has a density of 290 ...
Honeydew drops on leaves Bald-faced hornet sips honeydew from a Disholcaspis quercusmamma gall covered by sooty mold Magicicada cassini "cicada rain" slow motion Honeydew is a sugar -rich sticky liquid , secreted by aphids , some scale insects , and many other true bugs and some other insects as they feed on plant sap .
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This is the case with the emerald ash borer, an insect native to north-eastern Asia, which, since its arrival in North America, has killed millions of ash trees. [46] Another example of a beetle species that exhibits pest behavior are Melolontha Hippocastrani, that cause severe, long-term damage on young trees by feeding on roots. [47]
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Sooty mold (also spelled sooty mould) is a collective term for different Ascomycete fungi, which includes many genera, commonly Cladosporium and Alternaria. [ 1 ] [ 2 ] It grows on plants and their fruit, but also environmental objects, like fences, garden furniture, stones, and even cars.
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