Q : The problems of Ash borer
However, the professor in the lecture gives several reasons as a rebuttal to the author's point.
First, the professor in the lecture contends that removing the affected trees are not effective solution. the symptom of infected trees will be showed 1~2 years after infection. When we see the symptom, it would be too late to prevent from it and it can only work in urban area because the density of the forest make people impossible to cure them. This casts doubt on the reading passage's claim that removing the affected trees is easiest methods because it is easy to identify.
Next, the professor in the lecture insists that a chemical treatment is highly problematic because it can contaminate ground and water. Also, it will be not work if larvaes take a majority of the tree because larvaes can prohibit the tree passing the chemical. This counters the reading passage's assertion that a chemical treatment is good option to deal with.
Finally, the professor argues that biological pest control has a lot of issue. Biological pest like wasps can affect the environment by killing narrative species. Also, they can not survive when they face the climate that they are not familiar like cold winter. This refutes the reading passage's suggestion that biological pest control can be a good solution.