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a, Adult; b, eggs; c to g, young, or nymphs; 11, damaged cabbage
leaf with nymphs, adult bug, and eggs. (a and c to g about 3 times
natural size; b about 4 times natural size, hi about natural size.)
(See other side for life history .and control)
Bui-4 ti r. tr.,r.n, : vv n 1 P:.int ( I.r .;,r n. ctur Sh.
Lni:.-cJ 5.&, INprtcn n t AI:.--,nc ,-; Picture Sheet No. 5
(Murgantia histrionica Hahn)
Trie harlequin 1)lg is I sotutlhern plant pest and lives through the
winterr in ti' eI l adullst ue Ileal"r fields vwhlere its food plants are grown.
Ti',l bigrs le've their winter quarters erlyv ill thie spring and seek their
favorite food I) plinis, wvllicl are cabbage collard, turnip, horseradish,
kale, and related( crops. Ple increase inl population is started by the
etrs, whiichl are laid onil the under side of the leaves. These eggs hatch
in from 4 to 15 days, and tlie youn()lg, or nymphls, feed and develop on tlhe
lea ves of t lie plant it s, sucking t lie sap from the lea ves and stems. Shortly
afterward wvlite areas or blotlches appear about tlhe spots where the
fteeldintg lis occurred, and tlie injury often causes the plants to wither
amid dlie. Tlhe insect becomes full-grown in from 40 to 50 clays after
lha telling from tlie egg. Thie adult, or winged stage, is reached after
thie nymtvinphs have passed through five immature stages, or instars.
Within 2 or 3 weeks after becoming full-grown the female is ready to
(eI)posit eggs for another brood.
1Practice clean cultural methods throughout the season. Disk
and plow uln(lder all stalks and other refuse as soon as the crop has been
hamrvested. ThIe growing of trap crops, hand picking, and the use of
thle blow torch are also effective method(ls of keeping down the number
Control by insecticides is recommended only after preventive
measures to reduce tlhe numbers of the insect have been followed.
Spray or d(lust with derris or cube.
Use 1 pounds of derris or cube root powder (containing 4 percent
of rote,)one) witli a spreader and wetting agent in 50 gallons of water;
or, in sialler quantities, 12, ounces (10 level tablespoonl'uls) with a
sprea(ler and( wetting agent in 3 gallons of water.
For ldusting, use a (lerris or cube dust containinTg 0.75 percent
of roAteioie. To prepare this (lust, use 15 ounces of finely ground
rImot livingg a 4-percent rotenone content) to 4 potinds ad(i 1 ounce
If tie d(ilne(,it (finely grou(Id talc, clay, sulfur, tobacco, or other powder
excep'(')t lite(), or 18; polltu1ls of tlie root to 81 pounds of tlie diluent.
If tlie ri)th0ioie content of tlie (derris or ciube is greater or less than 4
perce' it, thle( tlie propo))rtiois of tlhe inert (lilueit must be varied
Begin sp)ravyiig or Wlidstitg lwhen tlie bugs first appear and repeat
tlie tireatlelIlt'ts as oftell as necessary. 16-13382
March 140 V'. S. Government Printing Office /
For sale by the Supi-rintendent of D)ociuments. Washington, I). C.-Price 5 cents /
UNIVERSITY OF FLORIDA /
3 1262 09082 4805
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