Does anyone have experience using the BioAdvanced 3 in 1 product? It contains fertilizer, insecticide and fungicide - and is applied as a soil drench at 1 quart per bush to (allegedly) provide 6 weeks of protection. If this product works well it would seem to be a viable alternative to weekly spraying and usage would seem to be much less labor intensive than weekly spraying. Has anyone used this product and does it work effectively?