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Pyemotes herfsi, also known as the oak leaf gall mite or the oak leaf itch mite, is an ectoparasitic mite identified in Europe and subsequently found in India, Asia, and the United States. The mite parasitizes a variety of insect hosts and is able to bite humans, causing red, itchy, and painful wheals (welts).
Hundreds of thousands of the tiny wind-soaring and itch-inducing critters can fall from trees every day and are packed with a venom that can paralyze prey 166,000 times their size.
Oak wilt is a devastating exotic disease, killing some trees rapidly in a single season. [7] Oak wilt is an important disease in urban areas where trees are highly valued. . The disease reduces property values because of the loss of trees and is economically costly to the property owner since they or the local government must pay for tree remo
Aceria mackiei, previously Eriophyes mackiei, the live oak erineum mite, is an abundant eriophyoid mite that produces leaf-blister galls on coast live oak, interior live oak, huckleberry oak, and canyon live oak. [1] This mite's ability to induce galls in oaks of both the black oak group and the intermediate oak group is unique. [1]
Cronartium quercuum, also known as pine-oak gall rust is a fungal disease of pine (Pinus spp.) and oak (Quercus spp.) trees. Similar to pine-pine gall rust , this disease is found on pine trees but its second host is an oak tree rather than another pine.
The oak timberworm is a known vector of the destructive fungus Bretziella fagacearum, which causes oak wilt. [6] Oak wilt is major cause of oak mortality in some regions and has been detected in 24 US states. [10] Oak wilt can cause rather sudden mortality in host trees due to the disruption of sap and water flow in the xylem. [11]
“As you travel, observe what is thriving in the soil types you move through and you will find trees such as black oak, blackjack oak, post oak, Southern red oak (Quercus falcata) and many more ...
An example of the latter type is the aphid, which forms marble-sized galls on the leaf stems of cottonwood trees. While these galls have thin walls, they harbor entire colonies of aphids within. When the time is right, a slit appears on one side of the gall, allowing the aphids to escape as the slit's lips unfold.