Here at Lansing, the small, yellow, oval eggs appear late in August.
In Tennessee they would be found under the scales in their cotton
wrappings many days earlier. The eggs are 1-40 of an inch long, and
1-65 of an inch wide. These eggs, which are very numerous, hatch in
the locality of their development, and the young or larval lice, quite
in contrast with their dried, inert, motionless parents, are spry
and active. They are oval, (Figs. 113, 3 and 4), yellow; and 1-23 of
an inch long, and 1-40 of an inch wide. The eyes, antenna (Fig. 113,
5), and legs, (Fig. 113, 6), are plainly visible when magnified 30
or 40 diameters. The 9-jointed abdomen is deeply emarginate, or cut
into posteriorly, (Fig. 113, 3), and on each side of this slit is a
projecting stylet or hair, (Figs. 113, 3 and 4), while from between the
eyes, on the under side of the head, extends the long recurved beak,
(Fig. 113, 4). The larvæ soon leave the scales, crawl about the tree,
and finally fasten by inserting their long slender beaks, when they so
pump up the sap that they grow with surprising rapidity. In a few weeks
their legs and antennæ seem to disappear as they become relatively so
small, and the scale-like form is assumed. In the following summer the
scale is full-formed and the eggs are developed. Soon the scale, which
is but the carcass of the once active louse, drops from the tree, and
the work of destruction is left to the young lice, a responsibility
which they seem quite ready to assume.
[Illustration: Fig. 113.]
In my observations I have detected no males. Judging from others of the
bark-lice, these must possess wings, and will never assume the scale
form, though Prof. P. K Uhler writes me that the males of some bark
lice are apterous.
REMEDIES.
If valued shade or honey trees are attacked by these insatiate
destroyers, they could probably be saved by discreet pruning--cutting
off the affected branches before serious injury was done, or by
syringing the trees with a solution of whale oil, soap--or even common
soft soap would do--just as the young lice are leaving the scales. It
would be still better to have the solution hot. Whitman's Fountain Pump
is admirable for making such applications.
Fig. 1 is slightly magnified; the others are largely magnified.
* * * * *
[Illustration: Fig. 114.]
MOTHERWORT AS A HONEY PLANT.
(_Leonurus cardiaca L._)
Public-domain text, read in full here on John Shaqi.
Reviews
Reviews
No reviews yet
Be the first to share your thoughts on this work.
Elsewhere in the archive
Join the Discussion
Join the discussion
Sign in to leave a comment or review.
Sign InorCreate an account