A manual of rice seed health testing - IRRI books - International Rice ...
A manual of rice seed health testing - IRRI books - International Rice ...
A manual of rice seed health testing - IRRI books - International Rice ...
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additional precaution, the multiplication<br />
plots <strong>of</strong> the <strong>International</strong> <strong>Rice</strong><br />
Germplasm Center (IRGC), INGER,<br />
and the Plant Breeding, Genetics,<br />
and Biochemistry Division are inspected<br />
regularly at specified growth<br />
stages. Data are recorded as outlined<br />
in SES. The Philippine Plant Quarantine<br />
Service's certifying <strong>of</strong>ficer uses<br />
the data as basis for issuing a<br />
phytosanitary certificate. A summary<br />
<strong>of</strong> crop <strong>health</strong> data taken in<br />
1990 is presented in Table 10.3.<br />
Table 10.3. Percentage <strong>of</strong> entries affected by <strong>rice</strong> diseases among IRRl's incoming a and outgoing<br />
<strong>seed</strong> multiplication lots, 1990 dry and wet seasons.<br />
Disease<br />
Entries without diseases<br />
<strong>Rice</strong> tungro<br />
Grassy stunt<br />
Ragged stunt<br />
Sheath rot<br />
Sheath blight<br />
Stem rot<br />
Narrow brown leaf spot<br />
Leaf scald<br />
White leaf streak<br />
Blast<br />
Brown spot<br />
Incoming b<br />
Outgoing c<br />
Dry season Wet season Dry season Wet season<br />
86.39<br />
1.44<br />
0<br />
0<br />
7.85<br />
0<br />
0<br />
0.72<br />
0.06<br />
0<br />
0.28<br />
0<br />
0.38<br />
0<br />
0<br />
0<br />
18.01<br />
0.76<br />
0<br />
0<br />
1.14<br />
0<br />
0.38<br />
0<br />
77.50<br />
2.27<br />
0<br />
0.01<br />
12.14<br />
0.08<br />
0<br />
0.28<br />
0<br />
0<br />
0.14<br />
0.01<br />
4.60<br />
3.99<br />
0.02<br />
0<br />
14.29<br />
1.97<br />
0<br />
3.08<br />
59.26<br />
0.01<br />
0.76<br />
0<br />
Bakanae<br />
Bacterial leaf streak<br />
Bacterial blight<br />
Leaf smut<br />
False smut<br />
1.55<br />
0.11<br />
0<br />
0<br />
0.06<br />
0<br />
76.24<br />
1.14<br />
0<br />
0<br />
1.22<br />
6.90<br />
0.07<br />
0<br />
0.04<br />
0<br />
68.89<br />
1.18<br />
1.98<br />
0.28<br />
Bacterial stripe d<br />
Sclerotium <strong>seed</strong>ling blight<br />
1.33<br />
0.33<br />
0<br />
0<br />
0.01<br />
0.02<br />
0.01<br />
0<br />
a Diseases observed on plants originating from incoming <strong>seed</strong>s were not introduced.<br />
b Based on a total <strong>of</strong> 1,808<br />
entries (dry season) and 261 entries (wet season). c Based on a total ot 14,148 entries (dry season) and 10,381<br />
entries (wet season). d Bacterial stripe and sclerotium <strong>seed</strong>ling blight observed at the <strong>seed</strong>bed stage.<br />
10.2 Schematic<br />
drawing showing<br />
percentage <strong>of</strong> plants<br />
in a 2-row field plot<br />
with 4 levels <strong>of</strong><br />
stress incidence.<br />
10.3 Schematic<br />
drawing showing<br />
percentage <strong>of</strong> plants<br />
in a field plot with<br />
4 levels <strong>of</strong> stress<br />
incidence.<br />
Field inspection 57
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