My farm are ogarnic.Recently there is a lot of Aphid.I use Horticulture oil spray but I need to spray every 3-4 days.Is there other way to total get rid of them?Where do they come from?
Find someone on the net that sells Lady Bugs in quantity. Tell them how big an area you need to control. Turn the beetles loose in the evening. They're your best source of aphid control. Your only problem may be importing them into Tahiti.
