Are pesticides harmful to bees?

New research has found that chemicals commonly used to fight plant diseases are damaging bees
.
Experts said that the abuse of chemicals may be one of the reasons for the widespread loss of bees in the United States
.
The importance of insects to farmers is self-evident
.
Bees feed on nectar to make pollen stick to its legs
.
When the bee lands on another flower, the drop of pollen is equivalent to fertilizing the second plant
.
The pollination behavior of bees bred a variety of fruits, vegetables, nuts and other crops
.
However, in the United States and other regions, about 30% of bees have died suddenly in recent years
.
DennisVanEngelsdorp is a researcher at the University of Maryland
.
He wanted to explore the causes of widespread and sudden deaths of bees
.
"The number of bees that die every winter accounts for one-third of the total, so on average 30% of bees have died in the past six years, which is an astronomical number
.
His research team studied the pollen grains carried by bees into their homes.

They found that pollen contains high levels of 35 different pesticides, which are generally used to protect plants
.
They also found that bees that eat some fungicides or biological organics are infected by a deadly microorganism called Nosema
.
However, kill Fungicides are necessary for agricultural purposes in the U.
S.

Mike Leggett studied pesticides from the Pest Management Industry Group-American Crop and Biological Organization
.