Ghazal, H.N., Al-Shahwany, A.W. and Al–Dulaimy, F.T. (2019) “Control of Gray Mold on Tomato plants by Spraying Piper nigrum and Urtica dioica Extracts under Greenhouse Condition”, Iraqi Journal of Science, 60(5), pp. 961–971. doi:10.24996/ijs.2019.60.5.4.