Some plants are naturally resistant to insect pests – insects do not attack them, presumably because of their physical and/or chemical composition. Other plants are tolerant to insect attack – the pests can attack them but the plants are not affected enough to die. Others are non-resistant, so insects can attack and kill them. Ryegrass (left) is non-resistant to grass grub attack, while tall fescue (right) is tolerant to attack by grass grubs.
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Photographs by Deric Charlton
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