VOA慢速英语20060411a

AGRICULTURE REPORT - Insects Eating Your Crops? Call on a LadybugBy Mario Ritter

Broadcast: Tuesday, April 11, 2006

I'm Steve Ember with the VOA Special English Agriculture Report.

There are lots of insects that farmers hate. But there also are some they like. These protect crops against damage from other insects. A good example is the lady beetle¹, also known as the ladybug.

Lady beetles² are a natural control for aphids. Aphids are tiny insects that develop colonies on plants and eat plant fluids. Aphids can also spread crop diseases. Adult lady beetles can eat fifty aphids a day. The young beetle larvae³ can eat hundreds of aphids.

Lady beetles are red, orange or black. They often have black spots, though some have light colored spots. Different kinds of lady beetles have different numbers of spots. There are lady beetles with four, five, seven and fourteen spots.


Asian Lady Beetle

Many of the well-known kinds of lady beetles come from Asia or Europe. They now are common throughout the United States.

American scientists imported one kind of lady beetle, the multicolored Asian lady beetle, as early as nineteen sixteen. They released them as an attempt to control some kinds of inspects. Over the years, the beetle has become established, possibly helped by some that arrived with imported plants on ships.

Experts say over four hundred fifty kinds of lady beetles are found in North America. Some are native to the area. Others have been brought from other places. Almost all are helpful to farmers.

The Asian lady beetles now in the United States probably came from Japan. The Asian lady beetle eats aphids that damage crops like soybeans, fruits and berries.

In the southern United States, Asian lady beetles have reduced the need for farmers to use pest-killing poisons on pecan trees. This popular tree nut suffers from aphids and other pests that the beetles eat.

But some people say the Asian lady beetle has itself become a pest. Lady beetles have no food after crops have been harvested. It is time for them to prepare for winter. Normally this is in the ground, but it can also be in someone's home. Some farmers also worry that the beetles may eat their late-autumn fruit crops.

Experts say Asian lady beetles may appear in large numbers in some years. But they say the insects are too helpful to consider pests.

This VOA Special English Agriculture Report was written by Mario Ritter. Read and listen to our reports at www.unsv.com. I'm Steve Ember.

1 beetle   

n.甲虫，近视眼的人

参考例句：

• A firefly is a type of beetle.萤火虫是一种甲虫。
• He saw a shiny green beetle on a leaf.我看见树叶上有一只闪闪发光的绿色甲虫。

2 beetles   

n.甲虫( beetle的名词复数 )

参考例句：

• Beetles bury pellets of dung and lay their eggs within them. 甲壳虫把粪粒埋起来，然后在里面产卵。 来自《简明英汉词典》
• This kind of beetles have hard shell. 这类甲虫有坚硬的外壳。 来自《现代汉英综合大词典》

3 larvae   

n.幼虫

参考例句：

• Larvae are parasitic on sheep.幼虫寄生在绵羊的身上。
• The larvae prey upon small aphids.这种幼虫以小蚜虫为食。