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City goes green in battle of bugs

SHANGHAI will reduce the use of pesticide to kill insects in public gardens by replacing it with the pests' natural enemies – other insects harmless to plants, the city greenery authority said today.

The practice has been well tested inside Expo sites, officials said. They have lately spread another 730,000 insect eggs to curb the number of pests in trees and other plants inside the park.

Long-horned beetles, for instance, are fatal to willow trees. Therefore, greenery workers scattered eggs of their natural enemies D. longulus sharps around the branches. D. longulus sharps eat the larvae of long-horned beetles.

Officials said that spraying pesticide will affect trees as well as beneficial insects and birds. "Not all insects are harmful," said Xia Xina, an official with the greenery management department of the Expo organizers. "Therefore, we should keep an eye on protecting the insects' variety in public greenery areas."

Later this summer, the practice will be introduced to several local communities and gradually be adopted on a larger scale, officials said.


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