Petur Arnaudov, 10 years, Sofia
I have drawn the pests on this plant: Pristerognatha fuligana, Deilephila elpenor, Xanthorhoe biriviata, Chrysolina herbacea, Phytoliriomyza melampyga, fam. Tenthredinidae, Impatientinum asiaticum, Aphis fabae. They would help dealing with the Himalayan balsam. Their larvae feed on different parts of the plant, thus damaging the plant and reducing its spread.