Genetic engineers have attempted to solve these problems by engineers plant which carry the gene for the toxin. The T toxin gene has been inserted from bacillus thuringiensis into the Ti plasmid, and thereby into plant. The genetically engineered plant have been tested and have been found to be resistant to insect attack. Corn has been made resistant to the European corn borer in this way. Before the development of this genetically modified strain of corn, farmers in the USA, china,brazil, argentina, south Africa and Europe used to lose about 7% of their crop to this pest. Conventional crop protection agents have limited effectiveness against the corn borer. As soon as the larvae make their way into the plant stalk they cannot be reached by products sprayed on the plant. With the development of Bt corn, the problem has been solved. The Bt toxin gene has now been inserted into several kinds of crop plant and it is hoped that it might lead to areduction in the usseof pesticides.