Effects of threshing methods and storage containers on fungus flora in stored wheat
1987
Sombat Srichuwong (Chiang Mai Univ. (Thailand). Faculty of Agriculture. Dept. of Plant Pathology)
Changes in fungus flora present in stored wheat (INIA 66) subjected to 6 different threshing methods were observed over a 6-month period, with samples being tested each month. In the first 2 months, both genera and quantity of seed-borne fungi showed little change, for all threshing methods. But after 3 months, the quantity of seed-borne fungi began to decrease rapidly by amounts that varied according to threshing method-with 720 rpm machine-threshed wheat having the greatest decrease, followed by 1,050 rpm machine-threshed wheat. At the same time, damage to the wheat caused by storage fungi increased after 3 months and varied according to threshing method with 620 rpm machine-threshed wheat being the least damaged, followed by hand-threshed wheat. Changes in fungus flora present in stored wheat (INIA 66) stored in 7 different types of storage container-jar, tin can, woven-polypropylene bag, jute sack, cotton bag, polyethylene bag (2 laryers), and polypropylene bag (2 layers)-were observed over a 6-month period, with samples being tested each month. In the first 2 months, the quantity of seed-borne fungi showed little change, in all containers. But after 3 months, the quantity of seed-borne fungi decreased rapidly in such containers as the cotton bag, jute sack and woven-polypropylene bag. At the same time, damage to the wheat caused by storage fungi increased rapidly and was greatest in the cotton bag, jute sack, and woven-polypropylene bag respectively. The other containers gave similar results of decreased seed-borne fungi and increased storage fungi. In this study, the most commonly observed seed-borne fungi were Dreshslera sorokiniana and Fusarium spp. respectively. The most commonly observed storage fungi were Aspergillus glaucus and Aspergillus flavus, respectively.
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