1) Interference between organisms that may include antibiosis or competition for nutrients and space. 2) When the effect of two chemical compounds is less than the sum of the two.
Adapted from: Tronsmo, A.M., Collinge, D.B., Djurle, A., Munk, L., Yuen, J. and. Tronsmo, A. 2020 Plant pathology and plant diseases. CABI, Wallingford.
ISBN 9781789243185.
https://www.cabi.org/bookshop/book/9781789243185/
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