It appears, then, that the machinery exists by which any one in the seed trade may quietly and easily commit enormous frauds. And it is plain that the very notoriety of this machinery, together with the condition of many of the samples of seed which we have examined (see [Chap. VI.]) prove that this machinery actually is employed by many seedsmen to the great injury of their customers.
We cannot, then, be doing wrong in urging any one to make trial of the seeds he is about to buy before he sows them, or even before he purchases them. Where the experience of a number of years already exists, the character of the seedsman is a guarantee for the good quality of his goods, and experience of this kind is indeed a more perfect carrying out of the system of preliminary trial or experiment, which we recommend especially to all new customers.
CHAPTER VIII.
ON THE INJURIES CAUSED BY INSECTS.
Root-crops are especially liable to injury from the depredations of insects. Thus the turnip may have its seed more or less destroyed by weevils. Immediately the seed appears above the ground, commences the attack by the turnip flea-beetles. The bulb is pierced by beetles, ending in those excrescences called “turnip-warbles;” and there is reason to think that even the root-fibrils are in some soils made the depositories of the eggs of insects, which give rise to extraordinary malformations.
Carrots and parsnips are liable to have the best-grown root made useless by its being pierced and eaten by the larvæ or grubs of a small fly, known as the Psila rosæ.
Even the mangel-wurzel, which has been so strenuously recommended as a substitute for the turnip on account of its freedom from insect attacks, and connected with which Curtis only describes a single insect, a leaf-miner, called Anthomyia Betæ, upon which he remarks that “these insects will seldom cause any loss to the mangel-wurzel crops should they ever abound to any extent.” In spite, however, of this, we find that the increased growth of this crop has caused a corresponding increase in the insect, to such an extent that, during the last two seasons, many crops have entirely failed from its depredations; as witness the following communication to the Agricultural Gazette for August 23rd, 1862:—
My mangel crop was drilled the 17th May, and came up most favourably. On Monday, the 2nd June, I asked my bailiff what was the matter with it; he said, “Oh, it was a sharp frost last night;” but on examination I found that instead of frost the leaves had within them a maggot, which had caused the plant to brown and die off. The late rains and growing weather have enabled the plant somewhat to revive, and also fresh plants to come up (for I had drilled 7 lb. per acre), but found to-day several leaves with maggots in them. My man told me “a quantity had eaten themselves out of the leaf and dropped;” and that he saw “a vast number of sparrows picking up those maggots.” I send you herewith some plants I brought up from the farm. My idea is that the seed was damp and bred the maggots, or that the leaves had been “struck with a fly,” and then the maggot followed. You will please let me have your ideas upon these points.—S. S.