新手上路
太医令(从七品下)
- 积分
- 10
- 获赠鲜花
- 608 朵
- 个人财富
- 696 金币
- 注册时间
- 2006-5-20
|
楼主 |
发表于 2008-3-26 15:22
|
显示全部楼层
友情提示: 请千万不要登入陌生网站输入QQ号和密码,以防诈骗。
联系我时,请说明是从哪儿看到的,谢谢。
Bed bugs and their relatives represent a small group of ectoparasites which require a blood meal in order to complete their life cycles. They are frequently encountered in homes and if left uncontrolled, may quickly become established and infest adjoining rooms and dwellings.[/FONT] 4 p: U, m# Y1 K! F! e1 q
: v F5 N- {- a6 I/ j! TDescription and Biology:[/FONT] [INDENT]Adult bed bugs measure approximately 1/5 inch in length by 1/8 inch in width. They are reddish-brown in color and typically oval and flattened in shape. After feeding, the abdomen becomes engorged giving the bed bug a somewhat elongated appearance. Immatures are yellowish-white in color. The head bears piercing-sucking mouthparts which enable bed bugs to pierce the skin and retrieve blood from their hosts. The antennae have four segments and two compound eyes are visible. The wings are reduced to short pads and incapable of generating flight. Eggs are white and approximately 1/32 inch long.[/FONT] . K8 n0 q# x" O8 O. J& D
3 E8 W3 O$ p0 j
[/INDENT]Life Cycle and Habits[/FONT]
3 B# d' _5 f- T# p$ c& a6 q4 l6 }1 Y, {) V) a4 H8 _; S) F/ E
[INDENT]Bed bugs are nocturnal in their feeding habits, hiding in crevices and cracks during the day. A female can lay a total of 200 to 500 eggs. The eggs are laid in batches of 10 to 50 in areas where the insects hide. The young are hatched in four to 28 (usually about 10) days, depending upon temperature. Newly hatched bed bugs feed and molt five times before reaching maturity. All of the instars are tolerant to starvation and can endure several months or more without a blood meal. In one year, there may be three or more generations. Usually, one blood meal is taken between egg deposition and each instar molt. [/FONT]9 s9 L# K9 x# K' Y* o! }
$ `# S0 C/ |) W1 M3 u) }[/INDENT]Host(s): [/FONT][INDENT]Hosts include man, rats, guinea pigs, rabbits, bats, poultry, birds and other warm-blooded animals. The Cimicids in North Dakota that affect man include the common bed bug, [I]Cimex lectularius[/I], and the eastern bat bug, [I]C. adjunctus[/I].[/FONT] 2 |0 d/ h$ ^ n& r9 \( a, ]4 K- \
" ?3 B( R& |2 T8 D: e' y* Y
[/INDENT]Damage/Symptoms:[/FONT] [INDENT]When bed bugs bite, they become completely engorged with blood in from three to fifteen minutes, depending on the bed bugs age and sex. A fluid is injected into the wound while feeding which may cause irritation and inflammation. In many cases welts develop, however, persons bitten by bed bugs may react differently. In some cases, the bite causes little inconvenience. The fact that bed bugs take at least five blood meals prior to maturity has placed these insects under suspicion as potential vectors of disease. However, there is no convincing evidence that this is true.[/FONT] . E! i# L# {; J6 w" b, {! X
Initially, bed bugs are found in bedding and associated tufts, seams, and folds of infested mattresses. As the insects multiply, they spread to window and door casings, pictures, loosened wallpaper, plaster cracks, baseboards and partitions. They are readily moved about in clothing, traveling bags and suitcases, laundry, second hand beds and furniture. Bed bugs are found in just about any habitat which offers darkness, isolation, and protection. This includes new and old buildings. Even the best maintained households are not exempt from invasion, although proper sanitation is the best preventative measure against these and many household pests. Close relatives of bed bugs include the bat bug which is common in attics infested with bats, and swallow and chimney swift bugs which are frequent in homes inhabited by swallows, pigeons, and other wild birds. These insects prefer hosts other than man; however, they may feed on man if the opportunity presents itself.[/FONT]
3 r/ D( K' o1 J# E. G( P+ H4 e[/INDENT] |
|