Every year, I discover ants in the figs. It's not too bad - slice open and wash them out. If you miss a few, the ants have a nice crunchy texture and nutty flavor. However, the ants carry fungal spores, and it seems that the ant-infested figs also spoil before they reach their ultimate sweetness. Every year, I tell myself that "next year" I'll prevent the ant infestation.
Same with the cherries. Every summer, the leaves develop massive black cherry aphid infestations. I suspect that the ants cultivate the aphids. AFTER I see them, I get out the tanglefoot, but by then a lot of damage is done.
So this year WILL BE DIFFERENT! I actually did remember. What's up with that! Tanglefoot is great at stopping the ants from climbing the trees, and no toxic chemicals.
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The instructions state to wrap the tree tightly with plastic, before applying the tanglefoot. I cut wide strips from plastic grocery store bags. These have enough stretch to make snug, bark-tight bands. They also tear quite easily, so there is no risk of girdling the tree with them. They start to deteriorate in about a year, which is time for the new coating.
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I use a disposable plastic knife to apply the Tanglefoot. It's very gooey. Next to impossible to wash out of clothing.
I applied the same treatment to the pears, apples, cherries, and figs. The reason for also applying to the apples and pears is to reduce spread of disease by aphids.