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One of the severe disease of mango is anthracnose,it is difficult
to control because of it`s latent infection.In this trial,both
of Kinghwan and Irwin mango would produce about0.2∼0.4mm necroti
spot on fruit surface,2,7,14 days after inoculated by
C.gloeosporioides.and the re-isolated ratio of C.gloeosporioides
from the necrotic spot,3 days after inoculation on different stag
of fruit development, Irwin and Kinghwan were 9.0﹪ and 5.0﹪,
respectively, but we still
could find many appressria on the surface in 1mm2 under microscop
with 100x.it shows that the necrotic spot produced on the fruit
surface,which during the young(2 weeks after flowering),middle
(50 days after flowering)and green mature (90 days after flowerin
stags,might be the result of hypersensitive respones.In leaves,wh
inoculated with 105 spores/m1,the leaves age about 3cm length,the
result of respones to C.gloeosporioides would produce 14.2/cm2
lesions on Irwin datached leaves and 10.4/cm2 lesions on attached
leaves,and it shows significant difference between them,in Kinghw
mango also had the same difference,which lesion No.of detached
leaves was 10.2/cm2 and attached leavaes was 7.2/cm2.In the leave
of same size,but inoculated 104 spores/m1 C.gloeosporioides,the
leson No.of Irwin was 6.3/cm2, Kinghwan was 2.8/cm2, shows that
Kinghwan was more resistant than
Irwin mango in anthracnose.Inoculated different growth stage of
fruits,after postharvest and ripen,it was found that flowering
and young fruit stage were the best infection time,which lesion
No.was 7.5/cm2 on flowering and 7.2/cm2 on yong fruit,and dimesio
of necrosis was 0.98cm on flowering,0.56cm2 on young fruit stage.
The result showed singnificant correlation between mango leaves
and fruit on the reaction to anthracnose,where value was between
0.97∼0.99, in the meanwhile the R2 value of liner function
between mango leaves and fruit were 0.99 and 0.94, and it seems
that the leaves of mango may be use like
index to detect the resistant to anthracnose on mango breeding.
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