Female Tuta also tend to migrate to the top of the crop canopy to lay eggs but do not cause direct damage themselves.
Shape of mines
Tuta larvae produce a distinct ‘blotch’ mine with an accumulation of dark-coloured frass in one part of the mine.
Liriomyza bryoniae mines are linear with frass evenly distributed.
The notifiable pests, Liriomyza huidobrensis and L. trifolii, produce linear mines but they are more convoluted.
Damage to plant growing points
Under some conditions, which are not yet fully understood, young Tuta absoluta larvae migrate to the top of the plant where they graze more openly on the furled leaves. This is potentially very serious because it can rapidly result in destruction of the growing point.
Liriomyza larvae do not cause grazing damage to the growing point as described for Tuta absoluta. However, when populations are very large, excessive feeding by adult Liriomyza can cause direct damage to young plant growth.
Damage to leaf petioles and stems
Liriomyza larvae occasionally move into leaf petioles where they have the same effect as Tuta. However, they are not known to enter plant stems.
Fruit damage by Tuta absoluta
If a Tuta larva penetrates a fruit, the entrance point is often below the calyx where it may be overlooked during crop monitoring. However, the exit holes are larger and more obvious.
A Tuta larva may still be present inside a fruit when it is harvested. If so, it will continue to develop and then emerge in transit or storage.
Liriomyza larvae do not tunnel in fruit.
Source – https://ahdb.org.uk