We don't know whether they are resistant or not, as they are being grown in a section entirely outside of the area where the blight exists.
I think that in examining these specimens you will agree that they are of fairly high quality and good size, and if they prove to be resistant to the disease much may be expected from them.
Sober: I cannot say whether my chestnuts are different from the other paragon chestnuts or not, or whether they are as resistant to the blight.
Previous investigations seem to show that certain pure strains of Japanese and Korean chestnut are resistant to the blight.
While some scientists are irradiating seeds and plants in an effort to obtain disease-resistant mutations, others are irradiating the fungi which cause the diseases.
They hope in this way to foresee the new strains of pathogenic microbes that will occur naturally in order to breed resistant plants before the new diseases appear.
What combination of resistant varieties, cultural methods, and chemical treatment will control the disease?
So far, the most economical means of reducing the ravages of plant diseases has been to breed resistant plant varieties.
Resistant plants show no effect of the chemicals, but sensitive plants suffer damage in actively growing roots and shoots.
Rivers of James Island, South Carolina, has resulted in the production of disease-resistant races.
Special interest attaches to experiments made in the United States to endeavour to raise races of cotton resistant to the boll weevil.
The method employed is to select, for seed purposes, plants which are resistant to the particular disease.
Probably by unconscious selection of surviving plants through long ages this type has been evolved in Guatemala, and experiments have been made to develop weevil-resistant races in the United States.
Crocs are also exceptionally resistant to disease and thus may be of great use in medical research.
It only makes cockroaches or pests immune or resistant to such poisons.
It was a tumult in which the terrible strain of the night and morning made a resistant pain:--she could only perceive that this would be joy when she had recovered her power of feeling it.
These thorny bushes seem to be resistant to browsing, and elsewhere have been noted in abundance in woodlands heavily used by livestock.
Chestnut oak seems to be relatively resistant to drought.
There was, however, a special reason why the non-resistant teaching of Jesus should be preserved even when its historic background was lost.
They become resistant to the suit of men who are of ordinary economic status.
Small-pox is an old story to the white race, and the death of the least resistant strains in each generation has left a population that is fairly resistant.
The fact that races long submitted to the action of alcohol have become relatively resistant to it, therefore, does not in itself answer the question of whether alcohol injures the human germ-plasm.
Compared with the Negro, he is relatively resistant to phthisis and will survive where the Negro dies.
Not only does it show that one's vital organs are in good running order, but it is probably the only means now available of indicating strains which are resistant to zymotic disease.
The Negro is strongly resistantto these and can live where the white man dies.
It is ordinarily resistant to "contamination" by other factors with which it may come in contact in the cell.
All the foregoing points in one direction, namely, that if the tissues are maintained in sound health, they form a very resistant barrier against bacteria.
Professor Marshall Ward has experimented with the resistant spores of Bacillus anthracis by growing these on agar plates and exposing to sunlight.
There seems to be some evidence for supposing that the bitter bacteria produce very resistant spores, which enable them to withstand treatment under which the lactic acid succumbs.
An arthrospore is said to be larger, more refractile, and more resistantthan an ordinary endospore.
Like other spores, they are extremelyresistant to heat, desiccation, and antiseptics.
When the spores are dry they are much more resistant than when moist.
The resistant spores are irregularly placed in the rod, and may cause considerable variations in morphology.
They are also said to be more resistant and of quicker growth.
Pneumonia depresses the resistant vitality of the tissues, and thus affords to the diplococcus present in the saliva an excellent nidus for its growth.
The channels of infection by which organisms gain the vantage-ground afforded by the depressed tissues are various, and next to the maintenance of resistant tissues they call for most attention from the physician and surgeon.
It will kill the bacillus of diphtheria, though not always moreresistant germs.
This concentration of effect is of importance in flax cloth, and especially linen treatment, where the peculiarly resistant cutocelluloses have to be attacked and a considerable proportion of waxy by-products to be removed.
Fermentation (yeast) experiments also showed a divergence from the resistant behaviour of the pentoses, a considerable proportion of the furfuroid disappearing in a normal fermentation.
It is to be noted that the presence of the benzoyl group renders the cellulose more resistant to hydrolytic actions.
The author has isolated the more resistant constituents of the cell-membrane by boiling with dilute alkalis, and exhaustively purifying with alcohol and ether.
The proteid and mineral constituents are attacked more or less, and the celluloses themselves are not entirely resistant to the action.
It is evident that the pentosanes of wheat are localised in the more resistant tissues of the grain.
Also it is established that the molecular aggregate which constitutes a cellulose is of a resistant type, and undoubtedly persists in the solutions of the compounds.
They are, however, not affected by diastase; and generally are more resistant to hydrolysis.
Monobenzoate prepared as above described is resistant to all solvents of cellulose and of the cellulose esters, and is therefore freed from cellulose by treatment with the former, and from the higher benzoate by treatment with the latter.
This 'furfuroid' while equally resistant to alkalis as the normal cellulose group with which it is associated, is selectively hydrolysed by acids.
The incompleteness of fermentation of the products is certainly due in part to the presence of furfural-yielding carbohydrates, which are resistant to yeast.
Kaolin, when carefully freed from its impurities, as far as this is possible, is peculiarly resistant to the action of water.
The most suitable clays, when fired, have a thin 'skin' of vitrified material which is very resistant to climatic influences, and so long as this remains intact the ware will continue in perfect condition.
Some of these grains of mineral matter are so minute and so resistant to the ordinary chemical reagents as to make it extremely difficult to distinguish them from clay.
Rapidly heated fireclay is seldom so resistant to heat under commercial conditions as that which has been more steadily fired.
And even though the pernicious drug craving is not created, considerable harm is done to the child, because its body is left weak and non-resistant to diseases of infancy and childhood.
Surprise is a valuable blight-resistant variety belonging to Pyrus communis and promises to make a blight-resistant stock on which to top-work commercial varieties.
Reported as hardy, blight-resistant and better than Kieffer.
The teeth are mobile; they are articulated with the palatine bone, in which they are inserted in small depressions, and a resistant fibrous tissue serves as the means of union.
These hæmatozoa are more resistant than bacteria, but they nevertheless end by being dissolved after twenty to thirty minutes’ contact in the 1 per cent.
The venoms, although more resistant to the influence of heat, behave, therefore, like these latter, and exhibit the closest affinity with them.
This neurotoxin, as we have seen, shows itself very highly resistant to heat.
The separation can nevertheless be effected by the aid of heat, if we make use of certain venoms that are particularly resistantto high temperatures, such as those of the Cobra or the Krait.
Deglutition is slow and painful, but the gastric and intestinal juices are so speedy in action, that the digestion of the most resistant substances rapidly takes place.
It has been found by Kyes and Sachs that, under the influence of hydrochloric acid, cobra-hæmolysin becomes resistantto heat to such an extent that it is not destroyed even by prolonged heating at 100° C.
The lecithin takes part in the reaction by combining with the venom to form a hæmolysing lecithide more resistant to heat than its two components, for it may be heated for several hours at a temperature of 100° C.
The latter dies in ten hours; the animal inoculated from the first tube dies in twelve hours; the one inoculated from the second tube in twenty hours, and the third proves resistant without any symptom of poisoning.
In addition to these intestine troubles, the pro-slavery party made strenuous exertions to fasten upon the society the responsibility of the opinions and proceedings of its non-resistant and no-government members.
The northern border of Alaska, as well as the shore of Bering Sea, is mostly low and the rocks soft, although certain of the sea-capes are bold and are evidently composed of resistant material.
This series of concentric ridges and intervening valleys, surrounding a high and rugged region of more resistant rock, furnish an admirable illustration of the influence of rock texture, hardness, etc.
As the edges of the more resistantbeds became more and more prominent the eastward-flowing streams cut deeper and deeper into them.
At the same time lateral branches were developed which followed the outcrops of the less resistant beds and eroded them away so as to leave the hard beds in bold relief.
The importance of this resistant superficial layer on the minor features of the relief of the submarine banks, etc.
The rocks on the two coasts are similar, being for the most part resistant crystalline schists, gneisses, granites, etc.
The resistant vineyards of France and California are now started almost entirely with bench-grafted vines.
Vulpina is lessresistant to black-rot than Æstivalis but somewhat more resistant than Labrusca.
The vine is very hardy, unusually free from fungal diseases, is very resistant to phylloxera and has been used in France as a phylloxera-resistant grafting-stock.
Definite, useful knowledge, so far, goes little further than the establishment of lists of species and varieties, the latter subject to change, that are most useful in setting resistant vineyards.
The reconstruction of phylloxera-ridden vineyards by the use of resistant stocks is possible only because some species and varieties are, as has been said, more resistant to the root-louse than others.
There are no better resistant stocks than Riparia gloire and Riparia grande glabre, wherever they are put in soils that suit them.
The subject of stocks resistant to this pest has been discussed in Chapter IV and need not be taken up again.
Through the use of resistant stocks, phylloxera is now defied in Vinifera regions.
Like those of Vulpina, the roots are slender, hard and resistantto phylloxera.
Some of these species are hard to propagate and difficult to suit in soil and climate so that but two of them are much used for resistant stocks.
The vine is very resistant to phylloxera and withstands drouth well.
Those who have had most experience with resistant stocks maintain that all American grapes require rather deeper plowing than European grapes on their own roots.
In moist soil, the cion roots may develop vigorously and must be removed before they grow too large, or they may prevent the proper development of the resistant roots.
The vines are grown from cuttings only with difficulty and this prevents the use of this species as a resistant stock.
The muscles of his cheeks moved in hard lumps beneath his fists as if he were champing some resistant substance.
This organism is smaller than any known species of Trichonympha; it is more resistant to warm weather than the other hypermastigotes.
To subserve this function, they are extremely resistant to the attack of reagents.
You have survived where men less resistant have gone down.
Sturdy, more frost-resistant than bees, they were already on the wing and preying on the benumbed flies.
Moisture-loving plants died out or were driven out by drought-resistant species, and as the climate and vegetation changed, so did the animals.
This system works because the flowers produce so many seeds, and because the seeds themselves are marvelously drought resistant and programmed to sprout only at the right time and in the right place.
The general use of steam under pressure in the large canning factories affords a high degree of protection against the anaerobic bacteria and their resistant spores.
But at this stage he had become mentally resistantand resentful.
