The new rhubarb culture; a complete guide to dark forcing and field culture, how to prepare and use rhubarb . uence. During the spring and earlysummer, he is likely to notice some stalks with a gummysubstance about a puncture near the leaf, although itsometimes appears quite close to the root. The gummysubstance is partially dried sap which leaks out fromthe puncture produced by the work of the rhubarbcurculio shown in the illustration: a is the grub wormwhich does the actual damage. The grubs feed uponthe root as well as the stalk: h shows the pupa form andc the full developed curculio which
The new rhubarb culture; a complete guide to dark forcing and field culture, how to prepare and use rhubarb . uence. During the spring and earlysummer, he is likely to notice some stalks with a gummysubstance about a puncture near the leaf, although itsometimes appears quite close to the root. The gummysubstance is partially dried sap which leaks out fromthe puncture produced by the work of the rhubarbcurculio shown in the illustration: a is the grub wormwhich does the actual damage. The grubs feed uponthe root as well as the stalk: h shows the pupa form andc the full developed curculio which hatches from thepupa. The grubs are about three-quarters of an inchlong, white in color with a brown head. The pupa iswhitish and about half an inch long. The grown beetlesare brownish and covered with yellowish dust. Thepictures are somewhat magnified and the exact size isshown by the accompanying lines. Eggs are laid during HINTS AND HELPS. 119 the spring and summer in the young flower stalk ornear the crown of the ])hint. They hatch in a few days,and the grub goes lo woik ;it once on the root or stem,. The RiiuiJARiJ CuiicrLio. growing rapidly and developing into beetles from Augustto October according to the time of hatching. The in-sect seems to prefer laying its eggs upon the flowerstalks of the yellow dock, and if the dock ])lants in theneighborhood are destroyed and the rhubarl) not allowedto develop its flower stalk the number of eggs whichhatch will be very greatly reduced. The only otherremedy practiced is collecting and destroying the beetleswhenever noticed. If the dock jdants are quite thorough-ly disposed of, tlie insects will not do very serious dam-age. An illustration shows the appearance of a sectionof stalk which has been punctured and gnawed by thecurculio gruh making it worthless for market purposes. 120 THE NEW RHUBARB CULTURE. Late in the summer, a blight or spot disease attacksthe leaves, causing- brown, blistered patches to appear onthe foliage. Finall
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyo, bookyear1901
