时间:2019-01-11 作者:英语课 分类:农业与发展


英语课

AGRICULTURE REPORT – October 29, 2002: Pest Management


By Gary Garriott



This is the VOA Special English Agriculture Report.


Since nineteen-forty-five, farmers have used pesticides 2, poisons made from
chemicals, to kill insects that damage crops. One serious problem with pesticide 1 use
is that people get sick. Every year about five-hundred-thousand people are poisoned
by pesticides. About ten-thousand people die.


Some scientists are working to develop other ways to keep insects and disease 3
organisms 4 from harming crops. One method is to choose plants that show a natural
resistance 5 to certain insects. Then these plants are used to produce new plants. The
new plants will have more resistance than the parent plants. For example, corn or
maize 6 plants grown to have more Vitamin A than normal plants can fight off insects that feed on their leaves.


However, if levels of Vitamin A get too high, humans and animals that eat the maize may get sick. So it is
important to study this kind of insect control very carefully.


Some plants produce natural poisons against insects. For example, potato plants produce poisons everywhere in
the plant, including sometimes in the potato itself. These poisons kill insects. But they can also kill people.
People should never eat potatoes that have turned green after being left in the sun.


Another method is to plant crops when the harmful insects are not present. In this way the plants grow before the
insect population gets too large to damage them. Grains such as wheat and barley 7 are planted in this way to
protect them from an insect known as the Hessian fly.


Water also can be used to limit harmful insect populations. One method is to add a lot of water to alfalfa plants
growing in a field. Other smaller plants grow and limit insects like aphids. Limiting water in certain situations
can have the same effect.


Turning over the soil, called plowing 8 or tilling, is a way to keep small organisms that cause disease from
attacking the plant. Like the other methods, this must be done with care. Plowing can cause soil to be blown away
by wind and water. The loss of soil from plowing has become a major environmental problem around the world.


You can get more information about pest management from the group, Volunteers in Technical Assistance 9. You
can contact VITA through the Internet at its world wide web address w-w-w dot v-i-t-a dot o-r-g.(www.vita.org)


This Development Report was written by Gary Garriott.



Email this article to a friend
Printer Friendly Version



n.杀虫剂,农药
  • The pesticide was spread over the vegetable plot.菜田里撒上了农药。
  • This pesticide is diluted with water and applied directly to the fields.这种杀虫剂用水稀释后直接施用在田里。
n.杀虫剂( pesticide的名词复数 );除害药物
  • vegetables grown without the use of pesticides 未用杀虫剂种植的蔬菜
  • There is a lot of concern over the amount of herbicides and pesticides used in farming. 人们对农业上灭草剂和杀虫剂的用量非常担忧。 来自《简明英汉词典》
n.疾病,弊端
  • The doctors are trying to stamp out the disease.医生正在尽力消灭这种疾病。
  • He fought against the disease for a long time.他同疾病做了长时间的斗争。
n.有机物( organism的名词复数 );有机体;生物;有机体系
  • The organisms can be divided into discrete categories. 有机体可分为许多互不相联的种类。
  • The cell is the unit of which all living organisms are composed. 细胞是构成一切生物的单位。
n.抵抗力,反抗,反抗行动;阻力,电阻;反对;adj.抵抗的
  • Very little resistance was put up by the enemy.敌人没怎么进行抵抗。
  • An aircraft has to overcome the resistance of the air.飞机须克服空气的阻力。
n.玉米
  • There's a field planted with maize behind the house.房子后面有一块玉米地。
  • We can grow sorghum or maize on this plot.这块地可以种高粱或玉米。
n.大麦,大麦粒
  • They looked out across the fields of waving barley.他们朝田里望去,只见大麦随风摇摆。
  • He cropped several acres with barley.他种了几英亩大麦。
v.耕( plow的现在分词 );犁耕;费力穿过
  • "There are things more important now than plowing, Sugar. "如今有比耕种更重要的事情要做呀,宝贝儿。 来自飘(部分)
  • Since his wife's death, he has been plowing a lonely furrow. 从他妻子死后,他一直过着孤独的生活。 来自辞典例句
n.援助,帮助
  • She called and called but no one came to her assistance.她叫了又叫,但没有人来帮。
  • He will get the great possible assistance.他将获得尽可能大的帮助。
学英语单词
accessible singularity
Agapetes angulata
aporphine
arenaemyein
atavism reversion
auto-exciting
bacterial enteritis
basalt-plain
be unschooled in sth
building damage statistics
C. of E
cabinet radiation
cadavid
case mould plaster
center cracked tension specimen
chloropropanol
Consolidated Natural Gas
contextual effect
customer setup
damage water
deisidaimonia
dofetilide
doubletube plate condenser
durational verb
earthquake proof construction
electron configuration
Emiratizing
epoxy glass laminated sheet
Eraverm
F-format
failed broker
fellaheen
flame cut(ting)
foreign workers statistics
fusion warhead
Georgia Institute of Technology
honorablenesses
hydraulic classifier
hypoprogestinism
immunity from suit
incrust
indian-american
infrared remote control
isostearate
isotopic molecule
johnny bags
Kawaura
keep out
knight of the community/parliament
lead-acid storage battery
lockstitch
Lunache
lunar seismograph
machining constant
Macrosolen robinsonii
MediaFLO
mesalamine
Mglin
Mindanao
Mohembo
nova sofala(sofala)
oil production engineering
oncotrephin
one's bump of locality
out of door
pedia-gastrofiberscope
pigeon hawks
place utility
playpipe
police launch
power handling capacity
preexponential factor
primary current of a current transformer
quasi-two-dimensional
Quelpart I.
radio-electroencephalograph
read-write random-access memory
refering
representative rates of exchange
Rokitansky-Aschoff ducts
rubber anti-icer
sastre
selective electrode
separator-spatula
set afoot
ship control centre
Short Circuit Rating
Silver-grain
spidergrams
spring vegetable
start stop self-phasing code
stream layer
summission
three-tined
thrush breast
titrated
total labour force
triethyleneglycol
triple-screw steamer ship
urinary catheter
USAB
water beetles