FROM THE OTHER CATERPILLAR THREAD:
Whiteflies maybe?
From "Grow Great Marijuana" by Logan Edwards:
Whiteflies
The whitefly life cycle is interesting in that the larval stage does all the damage. The larva will hatch and reamin until it has quickly molted three times. Then it pupates and an adult emerges. Whiteflies behave just like spider mites. The insect hides underneath the leaf and sucks it's (sic) dinner from it, which results in white spots on the top side of the leaf.
Signs of infestation
The top surface of leaves on infested plants become pale or spotted due to these insects feeding on the underside of the leaves. Whiteflies are easily spotted with the naked eye. Heavily infested plants will produce a buzzing cloud of flies if shaken. They look like little white moths and are around two millimeters in size.
Controlling the Whitefly
Insecticidal soap will take care of an infestation, as will more toxic insecticies. Apply the soap (plus a wetting agent) to every part of the plant, including both sides of the leaves. This will act to block the breathing pores and suffocate the pests.
