Western White
Pontia occidentalis
Immatures

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Larva Development

Ova hatched May 20th.  Photo of 1st instar on the 21st
1st I.S.

Young instar on June 06, 2007
young instar

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This larva from ova  ex. June 30, 2007, .6 miles SW Monte Cristo Pk. East side of Utah HW 39,
 Wasatch Range, Weber County, Utah by Todd Stout.
Nicky Davis reared and photographed. Black Mustard was used as the host plant.

Last Instar -Lateral - July 22, 2007- 9:33 A.M.
larva

Last instar - Dorsal -  July 22, 2007 - 9:33 A.M.
larva


Set to Pupate - June 3, 2007
prepupa

PUPAE
9:56 A.M. July 25, 2007
52
9:57 A.M. July 25, 2007
54

9:47 P.M. July 30, 2007
pupa 57
9:49 P.M. July 30, 2007
pupa


1:48 P.M July 31, 2007
Butterfly eclosed 7:35 P.M. July 31, 2007
pupa
6:43 P.M. July 31, 2007 
Butterfly eclosed 7:35 P.M. July 31, 2007
pupa

1:16 P.M. July 16, 2007
Pupated on brown paper
so pupa is a similar color
20

1:16 P.M. July 16, 2007
Pupated on brown paper
so pupa is a similar color
20


Photo Details - ©Nicky Davis
First two photos are of larvae ex. by Todd Stout found female May 16, 2007, at 4200 feet.  I-215 and 2200 North off ramp, Salt Lake County, Utah.  Ova eclosed May 20, 2007 and were then set on Brassica nigra to feed.
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The rest of the photos are larva
from ova  ex. June 30, 2007, .6 miles SW Monte Cristo Pk. East side of Utah HW 39,
 Wasatch Range, Weber County, Utah by Todd Stout.
Nicky Davis reared and photographed.


Host Plants
Black Mustard== Brassica nigra

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