During an invasion of boxwood borer in August 2014, I was recommended this product which is commonly used in agriculture in citrus, strawberry and other crops.

The product is effective as it strikes the insect larvae before they do any damage and has eliminated all the green worms with webs that have attacked my boxwood hedge. However, it is essential to spray the product at the start of the attack as the Pyralid multiplies and in about a week can cause enough damage to dry out the leaves and kill the boxwood.

Frankly, after reading up on the subject, I should have used a less environmentally aggressive product and a pyrethroid would have sufficed.

Now we will have to wait until next spring 2015 to see if the affected hedge is finally dead. I will post the conclusion here.

Conclusion : a pyrethroid is enough