Posted: 13/07/2013 at 13:04
Plants grown without too many fertilisers......artificial fertilisers tend to,produce lots of growth at the expense of strength so organic ones....and grown in well cultivated soil will be more resistant to pests and diseases so that's my tip
Grow plants meant for your soil and comditions.....they are then less likely to suffer disease and pest attack.
Companion planting.....carrots and onions, tomatoes and tagetes, marigolds amongst your veg, etc.....helps too.
In dry hot weather spraying with water controls red spider mites in greenhouses and mites on conifers like picea albertiana conica (highly susceptible to picea mites).
Check out and understand what you grow.....what is prone to mildew, rust, etc and pests.....so that you can prepare and anticipate problems and deal with them ASAP.