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.

The maggot, or larvæ, here described is that of a fly called the

_Anthomyia (Pegomyia) betæ_, mangel-wurzel fly. An allied species will

sometimes be found on the common dock-leaves, mining their galleries

between the dermal cells of the leaves.

We have for some time observed the increase of this pest, and we are

prepared to state that now we seldom see a crop that is not greatly

injured by its attacks. Mr. Curtis thinks that the best method to

destroy them is to employ boys to crush the leaves between the thumb and

fingers at the part where the larvæ can be seen; and with this we fear

we must for the present be content, unless we could devise some means to

take the fly before its eggs are laid in the leaves.

We need not here dwell at length upon the natural history of those pests

of the turnip—the _Haltica nemorum_ (striped flea-beetle), and _H.

concinna_ (black flea-beetle), as the nature of their ravages are

tolerably well known. Thus much, however, may be said; namely:—

_a._ These insects are called fleas because they have the power of

hopping on being disturbed, much after the manner of a flea.

_b._ They have some five or six broods each year; the earlier ones

probably being bred on charlocks and other weeds of the same

natural order as the turnip; and hence, then, charlocks are pests,

not only as being weeds, but as breeding-places for one of our most

mischievous insects.

_c._ They migrate from their weed-haunts to the first crop of

turnips, where much of their mischief may be prevented by simply

dusting over the young plants with any fine powder, road-dirt

answering the purpose as well as anything else.

Various devices have been employed for keeping away and killing these

little creatures. We have used a contrivance for catching them, which

may be described as follows:—

Some thin board (or boards), making a surface of about 4 feet long by 2

feet wide, is furnished at one end with a pair of light wheels of just

sufficient diameter to lift the board about 2 or 3 inches above the

plants. To the other end may be attached two crooked handles in such a

manner that the machine can be wheeled flatly over the plants, or if

four wheels be employed, one at each corner, a single handle can be used

either to push or pull the implement. When used, it should have its

underside painted over with tar or any handy viscid substance.

This should be used on bright days, the operator pushing it over the

rows of turnips, so as, if possible, not to throw his shadow before. The

middle of the day will be best, not only for this reason, but also

because these creatures feed more actively at that time.

Now, our experience in the use of this simple contrivance on small

experimental plots convinces us that a small boy could easily keep under

the enemy in a good-sized field.

But now comes a very important question for consideration. Cannot we do

more than kill a few of these creatures? cannot we adopt such plans as

will render our _crops_ tolerably safe from their depredations? We think

so, and to this end advise the following method of proceeding:—

Let each turnip-grower prepare for the enemy by sowing from the eighth

to a quarter of an acre of turnips in a sunny part of the farm as early

as the first week in April. These patches would quickly attract all the

turnip flea-beetles from the wild _cruciferæ_ on which the first broods

seem to depend, and in this small compass they can be killed in detail

with the simple contrivance just described, so that when the real crop

comes up there will be none, or at least only a few, beetles to emigrate

to it; whereas, as we now manage, by the time the crop of turnips is

sown, enough of the creatures are too often bred to render it necessary

to sow two or three times before we can secure a crop.

_Anbury_ is an affection to which only the different sorts of turnips

are liable, in which case it differs from finger-and-toe, with which it

has been very much confounded, as this latter occurs in all kinds of

roots; namely, turnips, carrots, mangel-wurzel, &c., as well as both the

common and Swedish turnips.

[Illustration: _Fig. 11_ (Fig. 8 repeated). Finger-and-toe Carrot. Half

natural size.]

As a sample of an extreme case of finger-and-toe—_digitate_ root,—we

repeat the following figure of a Belgian carrot, in which it will be

seen that the forks gradually taper to the extremities; in fact, the

whole, instead of being a succulent fleshy tap or _fusiform_ root, in

which case it could readily be stored, is divided in fingers-and-toes,

which are liable to break off, and this renders the product next to

useless. Now, this affection may occur in any soil, as it is the result

of a degeneracy in the stock of the plant; but in the affection now to

be described the case is wholly different, as here the bulk of the swede

(fig. 12) is affected with rough, cancerous knobs, whilst the rootlets

support irregular knobs of a like kind, which have more the aspect of

suspended rows of ginger than fingers-and-toes.

Roots so affected soon rot, and have a fœtid odour, so that they are not

only useless themselves, but communicate canker and decay to the whole

store. In the putrid mass will be found maggots and flies and beetles of

different kinds; but as yet naturalists are not agreed as to whether the

nodules of disease are caused by insects, or whether these creatures are

merely attracted by the fœtid matter. We are, however, inclined to the

belief that some insects are connected with the diseased appearance in

the first place, whilst others afterwards step in to fatten upon the

decaying matter, induced by the first lot; but still it must be

confessed that the subject requires much more attention than it has yet

received, in order to settle these important questions.

Still it may be observed that one point has been universally admitted;

namely, that anbury only occurs to any extent in sandy soils, where

there is an absence of lime, a good dressing of which mineral is the

best safeguard against this affection. Still, in soils that are liable

to anbury, we should not recommend the continuance of turnip-growing, or

at least not so frequently in the rotation as has hitherto been the

case, and more especially as the soils which produce anbury to the

greatest extent are just those best adapted for parsnips and carrots,

which, if not wholly, may occasionally be very profitably grown in the

place of the turnip.

[Illustration: _Fig. 12._ Swede affected with Anbury. Nat. size.]

Having given a few notes on the more prominent forms of insect attacks

to which root crops are liable, we would now close this chapter, as

details of all the insect pests would occupy more space than we can here

allot to the subject; but to those who would inquire further upon this

fertile theme, we would advise the perusal of “Farm Insects,” by J.

Curtis, Esq., F.L.S., &c.

GENERAL CONCLUSIONS.

To render our subject as complete as possible, we direct attention to

the following practical conclusions, to which our whole argument upon

the science of root-growing points:—

First.—Cultivated roots are improved wild ones, only to be obtained

by gardening on the small, or farming on the large scale; this

gardening or farming being carried on by certain operations at

certain seasons which we have comprehended under the term of

cultivation processes.

Second.—The difference in sort of roots is caused either by

cross-breeding as the result of accident or design, or of the

education of some particular propensity which has been acted upon

by the intelligent seed-grower.

Third.—The maintenance of sorts in purity depends upon careful

selection of the right variety for the seeding examples.

Fourth.—The preservation of a good outline or shape of root can

only be maintained by selecting those of good _form_ to seed from;

for, as running to seed, multiform top, forkiness, “finger-and-toe”

in roots, is evidence of wild growth, so, then, cultivated plants

assuming this form are considered as degenerate, and seed from such

roots produces a malformed and poor crop.

Fifth.—The difficulties of getting good seed—whether of trueness to

sort, from carefully selected bulbs, or free from adulteration

either of old with new seed, or a mixture of charlock and others of

the same family—are very great. Where, however, good seed can be

depended upon, it is much cheaper, though at a considerable

increase of first seeds cost, as not only quality but the quantity

of live so considerably depends upon the truth and honesty of the

seedsman.

Sixth.—Injuries from insect attacks, though serious as affecting

the yield, are yet not due to the seed; and anbury, if it be due to

insects, only occurs in the turnip-crops, and then in particular

soils. The true insect attacks to be averted by simultaneous

action.

In fine.—_Good seed, of a true sort,—care in growth,—and a

watchfulness of enemies, includes the_ SCIENCE _and_ PRACTICE _of

Root Cultivation._

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=SCIENCE AND PRACTICE=

IN

=FARM CULTIVATION.=

BY

JAMES BUCKMAN, F.L.S., F.G.S.

No. 2.

=HOW TO GROW GOOD GRASSES.=

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ROBERT HARDWICKE, 192, PICCADILLY.

1863.

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HOW TO GROW GOOD GRASSES.

Science and Practice in Farm Cultivation · 第 8 / 51 章