|the buds are not blooming out. they turn yellow often times and fall off plant. on north side of fence and now in full sun
|Answer from NGA
July 8, 2010
|If your plant is otherwise healty, I suspect the flowers are being attacked by budworms. These are the larvae of a fly or wasp. The adult makes a little slit in the unopened flower bud and when the egg hatches the little larvae feeds on the inside of the flower. When it has finished feeding it makes a little exit hole and spins a web down to the soil where it pupates. Check those unopened buds to see if you can see a little hole. Or, pick off a few of the buds and look on the inside. If the petals are damaged, a bud worm is the culprit. These little pests are difficult to control because they are protected inside the unopened flowers but the good new is that the cycles of these pests rotate. Some years they are bad and others not so bad. Good luck with your passiflora.
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