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The MSU HISL database contains a worldwide species list of Xyleborini, a major group of ambrosia beetles, from the Catalog of Scolytidae and Platypodidae of S.L. Wood and D.E. Bright (1992) A USDA-sponsored information resource and key Archived 2018-12-08 at the Wayback Machine to the world genera of Xyleborini; American Bark and Ambrosia Beetles
The ambrosia beetles (such as Xyleborus) feed on fungal "gardens" cultivated on woody tissue within the tree. Ambrosia beetles carry the fungal spores in either their gut or special structures, called mycangia, and infect the trees as they attack them. Once a beetle chooses a tree, they release spores of this fungus along tunnels within the tree.
Xylosandrus germanus, known generally as the alnus ambrosia beetle or black stem borer, is a species of ambrosia beetle in the family Curculionidae. [1] X. germanus poses challenges in woody ornamental species and orchard crops such as apples and pecan.
It has been shown that the beetle is attracted to the smell of this fungus, which may concentrate attacks on specific trees. The beetle can infest branches as small as 1.5 cm (0.6 in) across and trunks 2.5 to 6 cm (1.0 to 2.4 in) in diameter. [5] This beetle is polyphagous, infesting many species of host trees. [7]
Xylosandrus compactus is a species of ambrosia beetle. Common names for this beetle include black twig borer, black coffee borer, black coffee twig borer and tea stem borer. The adult beetle is dark brown or black and inconspicuous; it bores into a twig of a host plant and lays its eggs, and the larvae create further tunnels through the plant ...
These symptoms, as well as signs (entry holes, larvae, beetles) of bark beetles, are key factors in diagnosis. Necrosis of xylem and phloem tissues underneath bark can be observed. Common symptoms include: [3] Wet discoloration on bark; Phloem necrosis; Beetle entry holes; Reddish sap oozing from entry holes; Foamy liquid from entry holes
The beetle penetrates through thin or cracked bark in the canopy branches. [1] It first invades and kill branches in the canopy of a tree, then spreads to the trunk, culminating in the death of the tree. [2] The females produce two or more generations annually. Large populations can develop in the lower trunk over a number of growing seasons.
Platypus cylindrus, commonly known as the oak pinhole borer, is a species of ambrosia beetle in the weevil family Scolytinae. The adults and larvae burrow under the bark of mature oak trees. The adults and larvae burrow under the bark of mature oak trees.