The fungus Itersonilia pastinacae Channon, which causes parsnip canker, was found to persist both on the surface of parsnip seed and also in the trash associated with the seed. The fungus on the seed coat could be inactivated by chemical surface sterilization. However, to inactivate it from the trash, it was necessary to treat the seed sample with a steam-air mixture at a temperature of 45.5�C for 30 minutes.
Heritability of teat number and its correlation with the production characters, growth rate, feed conversion ratio and backfat depth, were examined. Data were obtained from 456 Large White, 1370 and race and 78 Synthetic boars submitted to the Queensland boar performance testing station.Teat number (mean � s.e.) of Large White boars was 14.44 � 0.05, significantly ( P < 0.05) more than either Landrace (14.27 � 0.03) or Synthetic boars (14.10 �0.12). The heritability estimate (� s.e.) for teat number of boars was 0.20 �0.08 obtained from L paternal half-sib analysis of 1519 boars from 198 sires. Phenotypic correlations between teat number and the production characters were all almost zero.
Inoculation of field-grown tomato plants with a tomato strain of tobacco mosiac virus (TMV) when the first fruit commenced to ripen induced internal browning in 7.4 per cent of the 4049 fruit produced. Seventy-nine per cent of the plants produced some affected fruit. The production of affected fruit rose to a maximum 42 days after inoculation and declined rapidly to an insignificant level after 73 days. Internal browning did not develop on any of the 3987 fruit produced by the uninoculated control planting.
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