| 单词 | crown borer |
| 释义 | > as lemmascrown borer crown borer n. (a) Engineering = crown drill n. (now rare); (b) Entomology any of various insects, typically moths or beetles, whose larvae bore into and damage the crowns (sense 21a) of plants. ΘΚΠ society > occupation and work > equipment > piercing or boring tools > [noun] > drill > other drills jumper1769 screw drill1821 stop-drill1843 hand drill1845 Swiss drill1846 traverse-drill1853 crown borer1854 pin drill1858 foot drill1860 perforator1861 pin-bit1873 Archimedean drill1889 paddy1895 stope drill1908 stem1914 screw gun1945 1854 Inst. Mech. Engineers: Proc. 8 90 A crown borer, which being armed with 5 or more chisels..makes by percussion as already described, a circular cut to the required depth. 1869 Lawrence (Kansas) Republican Daily Jrnl. 21 Sept. 3/1 Mr Randolph, chairman of committee on orchards..described how and when he found the eggs of the crown borer, the manner in which the beetle punctured the bark and deposited the eggs. 1902 Encycl. Brit. XXXI. 643/1 Attempts are being made to substitute a rotary ‘crown’ borer for the percussion drill in sinking wells for petroleum. 1920 Farmers' Bull. No. 1027 22 The spittle bug, crown borer, crown miner, red spider, and other insects are often serious pests in parts of the western United States. 1948 G. M. Darrow & G. F. Waldo Growing Erect & Trailing Blackberries 27 The raspberry root or crown borer is one of the most widely distributed blackberry insects. 2004 Denver Post (Nexis) 10 Feb. b1 A crown borer became the insectary's answer to pasture-destroying knapweed. < as lemmas |
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