Thursday, May 24, 2012
Curled-up pecan leaves
In the photo at right you can see that the 5 leaflets on the end of this leaf are twisted and cupped. This type of damage was caused by the potato leaf hopper during the period of leaf expansion. The holes in the leaflets were caused by sawfly feeding, also earlier this growing season.
Potato leaf hoppers migrate through our area every spring. The damage caused by this insect varies from year to year and you will see several trees species affected (including pecan, walnut, ash, & maple). We do not recommend treating for this transitory insect and just let the tree grow additional leaves to replace the damaged ones.
leaf roll mite. In the photo at right, note that the margin of the leaflet is rolled into a tight, hardened gall-like structure. As the mite feeds on the edge of a leaflet during leaf expansion, it causes distorted cell growth, creating the "leaf roll". Leaf roll mites are fairly rare in a native pecan grove and we don't take steps to control what amounts to minimal damage.