|I have a navel orange tree
and I noticed the leaves curling up and mostly on the bottem of the leaves looks like a worm had crawled on it and left a resedue.What Can I do ?
|If you're finding caterpillars on the leaves you can use Bt (sold as Dipel or Thuricide). If you are not seeing caterpillars, the problem might be leaf miners instead. These are the larvae of a flying insect. They tunnel through the upper and lower surfaces of the leaves and leave little white trails. When they mature they exit the leaf. Because they are protected within the leaves pesticides will not be effective against them. If you have leaf miner damage, just leave the tree alone. A few tunnels in the leaves won't harm your tree.|