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(a) Intercropping with ‘push’ (or push–pull) strategies where semiochemicals [72,73] are released from trap crops (photograph courtesy of Rachel Monger (Immanuel International)). (b) Effects of the strength of the trap crop γ (small dark plants) on the probability of plants i becoming infected qi (see text for explanations) once the plants on the left of the figures are infected. (Online version in colour.)
