Strains - Classification by phenotype-

Symbol	Phenotype	Number of related strains
NBRP	Rearing is easy	3
S		8
T	Consomic strain	26
a	lethal: embryo & larvae	20
b	cocoon: shape & quality	15
c	cocoon: color	28
d	egg: shape & chorion	38
e	egg: serosa color	29
f	larvae: appendage & marking	39
g	larvae: marking	15
i	larvae: eye-, head-, & tail spot	13
k	larvae: body color	22
l	larvae: body color	24
m	mosaic & malformation	18
n	larvae: body shape	30
o	larvae: translucent skin	41
p	local cultivar(landrace)	28
r	chromosomal aberration	20
t	growth, voltinism, moltinism	24
u	pupa & adult	25
w	multi marker line	27
x	new mutant in analysis	61
他		7
Total		561