This year I have a bumper crop from my medium-sized apple tree, and a big crop from the pear tree. I don't really know if this is a fluke, or my spray has worked wonders. Nothing works to save the cherry tree which is under attack from a fungus. I hope Dougie releases some of the rules on insect sprays.
Into two gallons of water in your sprayer, add:
1 tbls Home Defence insect spray (pyrethins)
2 tbls Miracle Gro powder (iron and fertilizer for the leaves)
2 drops dish soap (disperses the oils)
1 tbls Neem Oil (fungicide)
1 tbls Tea Oil (fungicide)
1 tbls Epson Salts (added magnesium for plants, gives slugs a tummy ache)
1 tbls Borax (ants hate it, and protects from aphids)
This is a very light, mostly organic, spray. Spray every week, since it doesn't stick around. No residual after a wash or rain.
It only works if the slug or insect eats a lot of plants. My apples this year are 99% worm-free with very little scab.
Works on everything, but don't spray flowers if the bees are on them. The spray is very non-poisonous and you could probably drink it. :)
Don't use it in California since it causes cancer only there. :) along with pure spring water.
ps. now back to my happy sabbatical.