. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . our inches abovethe uppermost knot; so that though the injury did not showexternally, yet by holding the lower part of the stem andgently pulling at the ear, the stem came out of the sheath,leaving a stump behind of a few inches long attached to thehighest knot. This stump looked flaccid and shrunken, andat the point of severance, in almost all the specimens sent, thestraw was shrunk. The injury extremely resem
. A manual of injurious insects with methods of prevention and remedy for their attacks to food crops, forest trees, and fruit. To which is appended a short introduction to entomology . our inches abovethe uppermost knot; so that though the injury did not showexternally, yet by holding the lower part of the stem andgently pulling at the ear, the stem came out of the sheath,leaving a stump behind of a few inches long attached to thehighest knot. This stump looked flaccid and shrunken, andat the point of severance, in almost all the specimens sent, thestraw was shrunk. The injury extremely resembled that caused by the maggotof the American Fly, the Meromyza americana, but therewere no signs of this being present. The cause of the disease could not be made out withcertainty, but subsequent information from American obser-vation of a very similar attack known as Silvertop in Hay,points to Thrips-attack being very likely the cause of theinjury. (See Eeport of the Entomologist and Botanist,pp. 59—62 of Appendix to * Eeport of the ExperimentalFarms, Canada, to the Minister of Agriculture, 1889.) Tulip-root, or Sagging, caused by Stem dcvastatrix, Tulip-rooted Oat-plant. The disease known as Tulip-root in Oats takes its namefrom the swollen ^appearance of the base of the stem, whichbears some resemblance to a Tulip-bulb, though still more to n 2 100 CORN AND GRASS. a duck-necked Onion. This swelled stem is usuallysurrounded by a number of small doubled-up shoots, palein colour, and bent to and fro, instead of being properlyextended. The figure (p. 99) shows the appearance of anattacked plant as it is often seen ; the disease is also knownas Segging, or Sedging, from the Sedge-like appear-ance often assumed by the leaves From the healthy growthof the plant being checked there is necessarily much loss bothin straw and grain. This disease has been much noticed of late years, especiallyin Scotland; and on investigation in 1886 I found Eelwormspresen
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