Mexican bean beetle


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Mexican bean beetle
Physical Description:
Mixed Material
Benson, Mary F
United States -- Bureau of Entomology and Plant Quarantine
Bureau of Entomology and Plant Quarantine, U.S. Dept. of Agriculture ( Washington, D.C. )
Publication Date:

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Resource Identifier:
aleph - 030255684
oclc - 86173759
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a, Adult beetle; b, eggs; c,
e, bean leaf showing typical
natural size.)

larva; d, pupa
feeding injury.

(or resting stage);
(About 2'., times

(Ste other side for life hi.,tory .ad control)

Bureau of Ent'.m.,i ,iivm .iJ] Plint Q .JAr.Iitinel
UncJ St.irc. ).-rrtn.-cn, .., A I,..,,lr..- Picture Sheet N(O. 2

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(Ipll,, Ii 'n, 'lfrii'-f .stis M uls.)
Life History
The Mexican bean beetles overwinter in the adult or beetle
stage. usually.v in woodlands near b)ean fields. They leave their win-
ter quarters in the spring, and the female beetles lay their eggs on
the under side of the bean leaves. These eggs hatch in from 5 to 14
days. The resulting larvae feed principally on the under side of the
bean leaves. The larva grows rapidly, passing through four differ-
ent stages, or instars, similar in appearance except that each stage
is larger than the preceding one. It reaches full growth in from 20
days to 'v weeks. When full-grown the larva attaches itself to the
under surface of the leaf on which it has been feeding, or to some
nearby plant or object, and changes to the pupa or inactive stage.
After a period of about 10 days the adult beetle emerges from the
pupa. Within 2 weeks the female beetle is ready to deposit eggs for
another lbrood.
Spray or dust with derris, cube, or cryolite. Any of the follow-
ing insecticides applied to the beans so as to cotcr the Munder side of
th hl'(ir(s thorouqlhilq will protect the plants (spraying has given
better results than dusting).
Nf ra isi

To pIrepare a derris or cube spray, use finely ground derris or
cubl)e root (4-percent rotenone content) at the rate of one-half ounce
(2 level tablespoonfuls) to 1 gallon of water; or 11. ounces (10 level
tablespoonfuls) to 3 gallons; or 11., pounds to 50 gallons.
To prepare a cryolite spray, use 1 ounce (3 level tablespoonfuls)
of cryolite to 1 gallon of water; or 3 ounces (9 level tablespoonfuls)
to 3 gallons; or 3 pounds to 50 gallons.

To prepare a derris or cube dust, containing 0.5 percent of rote-
none. use 10) ounces of finely ground derris or cube root (4-percent
rotenone content) to 4 pounds 6 ounces of diluent (finely ground talc,
claV, sulJ)hur, tobl)acco, gypsum, or other powder, except lime) ; or
121., I)ounds to 871., x)iunds of the diluent.
To prepare a cryolite dust, use 3 pounds of cryolite to 2 pounds
(If diluent (finelyv ground talc or sulphur) ; or 60 pounds of cryolite
to 10) pounds of the diluent.
The tirsit application of insecticide (spray or dust) should be
nmade when Mexican bean I)eetles are found in the field or when eggs
b)eco)me numerous on the under side of the leaves. RIepeat every
week (or 10 dayss if the insects are numerous.
('aution: Cryolite should not be applied to beans after the pods
begin to florm.

3 1262 09082 4813
JUM, 9;7 U'. S. government t Printing Office
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