A parasite rearing tray developed to meet special requirements


Material Information

A parasite rearing tray developed to meet special requirements
Series Title:
ET ;
Physical Description:
2 p., 1 leaf of plate : ill. ; 27 cm.
Sellers, W. F
United States -- Bureau of Entomology and Plant Quarantine
United States -- Dept. of Agriculture
U.S. Department of Agriculture, Bureau of Entomology and Plant Quarantine
Place of Publication:
Washington, D.C
Publication Date:


Subjects / Keywords:
Insect cages -- Parasites -- Pollination   ( lcsh )
federal government publication   ( marcgt )
non-fiction   ( marcgt )


Statement of Responsibility:
by W.F Sellers.
General Note:
Caption title.
General Note:
"February 1936"--p. 1.

Record Information

Source Institution:
University of Florida
Rights Management:
All applicable rights reserved by the source institution and holding location.
Resource Identifier:
aleph - 030609782
oclc - 793288120
System ID:

Full Text

ET-74 I hi kJ

Uni Sta' Depar' nt of riciilt ,
DL of i,.t^ .... i.. j and Plant ..drantine

A PF ,AF :.T i -i. iL .... L ... | i..i.L. f .. LT IAL .'_,UIF,_J.

,',. c. f..le;. Division of Foreign ?.rasite Iitr.,l:..,tion1

1..: . ;'.*. t;'.y s dev o ,, tt our Central European field
L.e i?,eL-.3.. e . e'., of rasies fro the larvae of te pine
j_\.:'_LcJ1 l ..r -'L4 1 '-. r. e r.. r ssive st, ps involved in construe
of si .ficient size, but lacking ta nl0foot b rriers r. .iuced a pie<
r:. l. W'.:.,'t b ;.. l.::t of o.' s -. C. field-laborato. equipeen
t.'o s,5 C ..s : idas t-.;: ed iI its c:.:.tructio n y b of u
invest i.-tors,

n !a 1.1o i lot
shooet uoth
i. a t ray
O rf ,:p -
cr hi% st.
3 to other


7... c. plete ti'w (fig 1) is cciposed of two _'.'ts, tlhe "t V" ,L ic v dh eUU a oi .... y
"covr, srctum of which ar of w botto of
'i. Iray is cove,. : with corrugated v. i. -r fo,.: on one side only e ot" -
gI.tic;,s of !.. unfaced surface run longitudinally, Pnd they p, vide an excel-
lent pl.'ce for :e host larvae to web themselves and for the formation of
l ,r-_=lte cocoons -. d -L.. ria (fig. 2), The unbleached coIton ccveri. 4s held
tightly in ,ice ] the cover frame (which fits so ly over the t., n the
t:y) much in [hc :- fashion cloth is held 1 embroide h s e
cloth loosely place over the be tom of the cover I: .... .*.. faste:l c o
out.i"e edge., so that when the f eis pl.,',:- over the tray the cloth be-
( .-rc :e tart!l street _-h,_ :; e the up. 'r :]:es of the tray aid the frame arn
about flush.

7,>- size of the tray can be varied to su1t indivi ai
-a'e'.ts a.,i ,i tils of the t..j shown in figure 1 are:

T, a', --4'tsiiic- th inches; inside width i inches ; eiaht
5 inc;-,e'c. T thickness of ".eoo ue is five-e.' ths ich cor-
rzg:-.ti p..per hct. was.: ,t sliP.tly sialler than the t -r and held i place
^;'h-r-y ..e -,-, pp ... L'z-..r st:4. lpt w re pasted (flour ,.,... t ) to the bottoI
of -. c;rr:..t : aid thr outside and bottom e of the tra e
uL;- of r-te, ":.ch avd: .e hat would be h tacks or :l::
ic.zs for o .h. jp..ted useof ', tray over a period of years. To p 1

* Credi j uli be
S-r:in., fiela s
rearing tray.

x L. ~ LI.
.~. P.. n n~...i. ~A25I. ~2 i in.. P

. I I ,



insects from entering the cnc.7 of the grooves iiade by the corrugations and the
paper used in facing, the ends are moistened with flour paste, flattened to-
gether with a hammer, and held in place until dry. (Plastic wood or other
suitable r... c.i I might be used to close these openings.) From 4 to 6 holes
1 inch in diz-.mter were bored in the sides and ends of the tray to allow the
wo:-.Lors to introduce the buol.,ii_. .:'.ae as they were removed from the pine

Cover.--Inside measurements of the cover frame are not more than
one-eighth inch longer than the outside measurements of the tray; height 2
inches. The thickness of the wood used is about 1 inch (1-inch stock plbned
down). The corners of this frames were dove-tailed for additional strength.
The cloth is fastened with thumb tacks to allow easy adjustment hhen nec-dd,
As an additional pZe,.:.LAtion to keep the cloth taut, a hook-and-eye fastener
was used on each side to hold this frame in place.

The approximate cost of in,aterial and construction of the frames is S1.

As our material was collectdC just prior to the emergence of the para-
site-.o and the host was not supplied with food after removal from the pine
shoots, we do not know whether i':e tray is suitable or practical for prolonged
perils of feeding active host larvae. We placed about 1,000 host larvae in
a tray of this size.

- 3 -

Figure 1.-Rearing tray ready for use.

FiguAie 2.--Host larvae and tachinid puparia lying
In the corrugations on the bottom of the tray.

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