登入
選單
返回
Google圖書搜尋
Controlling the Clover-flower Midge in the Pacific Northwest
Albert Hansen
Alfred Glaze Smith
C. W. Creel
David Ernest Lantz
Edmund Burke McCormick
Edward Owen Guerrant Kelly
F. H. Branch
Frank Webster Farley
George James Burt
George Milton Warren
Harry B. McClure
Harry Baker Humphrey
Henry Milton Conolly
Homer Columbus Thompson
James French Wilson
James Herbert Beattie
John June Davis
John Raymond Horton
John William Roberts
Lewis B. Flohr
Madge Janet Reese
Marion Dorset
Philip Luginbill
William Walter Yothers
出版
U.S. Department of Agriculture
, 1918
URL
http://books.google.com.hk/books?id=2chBAQAAMAAJ&hl=&source=gbs_api
EBook
FULL_PUBLIC_DOMAIN
註釋
"Of all corn pests in the South one of the most serious is the larva, or young of the 12-spotted cucumber beetle -- the so-called southern corn rootworm. True to its name, it feeds on the roots, but in young corn it also drills a small hole in the stem just above the first circle of roots, boring out the crown and killing the bud. Attacked plants either die outright or are so badly stunted as to be unproductive. Lowland corn suffers the most and injury is greatest during cool, damp seasons. The adult, or beetle, is also exceedingly destructive; not, however, to corn, but to cucumber, squash and a great variety of other truck crops and ornamental plants. Progressive farming methods, as described in this bulletin, will reduce the ravages of this insect. Burn over waste places to destroy dead grass, weeds, and rubbish in which the beetles winter, If possible, avoid planting corn in fields which contained corn the year before. Enrich soil by planting legumes so that the corn will have a better chance of recovering from rootworm injury. Protect the bobwhite. This bird destroys many beetles of the rootworm. By careful observations, extending over a period of years, find out the dates between which the rootworm does the most damage; then time your planting so that it will fall either before or after these dates, taking into consideration, of course, other important factors in crop production." -- p. [2]