A Handbook of Rice Seedborne Fungi TW Mew and P ... - IRRI books

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Frequency level (%)120100East AsiaEuropeLatin AmericaSouth AsiaSoutheast AsiaSub-Saharan Africa806040200Detection level (%)504030201001990 1991 1992 1993 1994 1995 1996 1997YearFig. 19. Detection frequency (a) and level (b) of Microdochium oryzae from imported untreated seeds, 1990-97.(pionnotes) varying in size and thickness are scatteredon seed surface (Fig. 20a-c).c. Location on seedM. oryzae is most likely observed growing onsterile lemmas of the rice seed (about 55%) (Fig.21).Microscopic characterConidia (epispore)—borne on superficial stromataarising on lesions, bow-shaped; single-celled whenyoung, 2-celled when mature; one septum; occasionally2–3 septate; not considered at septum; thinwalled,hyaline, pink in mass, hyaline under the microscope(Fig. 22d). Measurements: 8.97–17.48 µ ×2.53–5.98 µ (PDA); 8.51–18.17 µ × 6.21–8.51 µ(PSA); and 10.36–15.64 µ × 2.30–5.52 µ (MEA).Colony characters on culture media (Fig. 22)Colonies on PDA at ART (28–30 °C) grow moderatelyfast, thinly spreading, and attain a 4.20-cm diamin 5 d. They are evenly zonated with uneven margins,orange with scanty, white aerial mycelia, andsomewhat pressed to the media. Colonies appear wetat the center, spreading outward with age. Thecolony on the reverse side of the agar plate appearsevenly zonated and light orange. At 21 °C under alternating12-h NUV light and 12-h darkness, coloniesare thinly spreading, grow moderately fast, and attain25
abcdFig. 20. Habit character of Microdochium oryzae (Hashioka and Yokogi) Sam. and Hal. showing orange pionnoteson the seed surface at (a) 8X, (b) 12.5X, and (c) 20X. cPhotomicrograph of M. oryzae showing lunar-shaped conidia d(40X).Observed frequency (%)6050403020100SterilelemmasAwnPartitionbet. lemmaand paleaEntirese edLemma/paleaonly orbothSeed partFig. 21. Observed frequency of Microdochium oryzaeoccurrence on the seed.Fig. 22. Plate cultures of Microdochium oryzae(Hashioka and Yokogi) Samuels and Hallet showingcolony growths on PDA, PSA, and MEA incubated atART, 21 °C, and 28 °C at 5 d after inoculation.26
Page 4 and 5: ContentsPrefaceVINTRODUCTION 1FUNCT
Page 6: PrefaceSeed health testing has beco
Page 10: Functions of seed health testingSee
Page 14 and 15: Table 3. Pathogen profiles closely
Page 16 and 17: Table 4. Germination (%) of untreat
Page 18: Microorganisms associated with seed
Page 21 and 22: Seedborne fungi causing foliage dis
Page 23 and 24: →ab→ef→f→cd →→Fig. 6. H
Page 25 and 26: Fig. 9. Occurrence of brown spot (O
Page 27 and 28: →deaebdedde→cFig. 11. Habit cha
Page 29 and 30: ported in 1910 in Japan. The causal
Page 31: Microdochium oryzae (Hashioka & Yok
Page 35 and 36: . Occurrence/distributionRice blast
Page 37 and 38: →abcdee→→e→→Fig. 25. Habi
Page 39 and 40: Fig. 28. Occurrence of bakanae (Ou
Page 41 and 42: ab→d→→→→f→→eg→→
Page 43 and 44: Detection frequency (%)120100East A
Page 45 and 46: orange. On the reverse side of the
Page 47 and 48: Detection frequency (%)120100East A
Page 49 and 50: Fusarium solani (Mart.) Sacc.syn. F
Page 51 and 52: verse side of the agar plate is zon
Page 53 and 54: ab→→f→→ce→d→Fig. 48. Ha
Page 55 and 56: Fig. 51. Occurrence of glume blight
Page 57 and 58: abece→dFig. 53. Habit character o
Page 59 and 60: ab→→→fefcdFig. 57. Habit char
Page 61 and 62: seedlings and reduction in tillers
Page 63 and 64: abcdFig. 62. Habit character of Til
Page 65 and 66: abeedefcfFig. 63. Habit character o
Page 67 and 68: ab→→ecdFig. 67. Habit character
Page 69 and 70: →→→→ab→d→→e→aFig. 7
Page 71 and 72: abcFig. 75. Habit character of Fusa
Page 73 and 74: a→→→→→→af→db→fce→
Page 75 and 76: →abf→→→f→e→→edc→dFi
Page 77 and 78: →→→→→→→→→→→
Page 79 and 80: abfecdFig. 88. Habit character of P
Page 81 and 82: →→→→→ab→decFig. 90. Hab
Page 83 and 84:
→ag→→fg→→b→e→cdFig. 9
Page 85 and 86:
→→→→abcdFig. 98. Habit char
Page 87 and 88:
abecedFig. 102. Habit character of
Page 89 and 90:
ReferencesAgarwal PC, Mathur SB. 19
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A Handbook of Rice Seedborne Fungi TW Mew and P ... - IRRI books

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