You
should communicate with your county horticultural commissioner, who,
through inspectors, will see that you have a good job done, at the right
time and at as moderate price as is compatible with good work. It is
impossible to 'eradicate' the black scale, but there is a great
difference in the amount that can be killed, and it pays to have a job
done as near perfectly as possible. Similar methods of attacking other
scale insects on citrus trees are used.
Finding Thrips.
How can the presence of pear thrips be detected in a prune orchard? Will
the distillate emulsion-nicotine spray control brown scale as well as
thrips?
You can find thrips by shaking a cluster of blossoms, as soon as they
open, over a sheet of paper or in the palm of your hand. The thrips are
very minute, transparent, somewhat louse-like insects. The spray you
mention would probably have little effect on the brown scale which would
still be in the egg state and under cover, at the time the early spring
spraying for the thrips.
Control of Pear Slug.
I am sending, under separate cover, some samples of cherry tree leaves
that have been attacked by a small snail or slug. Kindly let me know
what they are, and how to rid the trees of them.
The creatures you speak of are the pear slugs, or the cherry slugs, as
they are sometimes known. Although slimy, like the big yellow slug that
is a pest in vegetable gardens, it is no relation thereto, but is the
larva of an insect.
Pages:
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454