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Have you tried wood ashes or
Have you tried wood ashes or diatomaceous earth (which is a non toxic safe substance to use in the garden for ridding yourself of pests)? I would try that for pests, but with brown leaves I would think that the humidity isn't right maybe?...try heavy mulch and watering in the morning and at night to keep the ground moist...also, to keep animals out of your garden try planting a border of wormwood...this will deter most animals (like rabbits and moles) from eating up your garden. Also, plant marigolds throughout your garden to deter pests. Compatible with most all of garden plants. Hope this helps. Try companion gardening to help naturally deter pests as well. I like the book "Carrots Love Tomatoes". Hope this helps. Good luck!:)