Pine weevil attack only strikes sunlit pines, sparing shaded ones

Evidence

In June of each year a few white pines suddenly show wilted candles, which shortly thereafter turn brown and die. A pine weevil has bored into the terminal bud cluster and deposited eggs; the grubs, when hatched, bore down along the pith and kill the shoot. Such a leaderless pine is doomed to frustration, for the surviving branches disagree among themselves who is to head the skyward march. They all do, and as a consequence the tree remains a bush. … It is a curious circumstance that only pines in full sunlight are bitten by weevils; shaded pines are ignored. Such are the hidden uses of adversity. — Aldo Leopold, A Sand County Almanac, 302