1 > Leaf-miner: The
mine begins as a long, quite narrow corridor, usually not far from
the tip of a leaf segment. Usually this corridor follows the leaf
margin for some distance, but it may also run freely through the
blade and may then be stongly contorted. In the end the corridor
is directed towards the midrib, where an elongated blotch is formed,
overlying the midrib and some of the larger lateral veins. Frass
in a nearly continuous line in the initial corridor, in scattered
lumps in the later part of the mine. Primary and secondary feeding
lines very conspicuous when seen in transparancy. Pupation outside
the mine.
The mine starts as a very narrow corridor, usually close to the tip of a leaf segment and following the leaf margin. The later section of the corridor approaches the main vein, where an elongated blotch is made with long broad finger like extensions that lay over the secondary veins. In the initial corridor the frass forms an almost continuous line, in the blotch it is distributed in large scattered lumps. In fresh mines the secondary feeding lines are clearly visible. |