Int. 2018;4(6):391–396. The mean seedling length was expressed in centimeters. [Curculionidae, Coleoptera.] Seed is considered pure if it appears normal in terms of size, shape, and general outward appearance. It should be free from objectionable weed seeds -These are plants of weed species which are harmful in one or more of the following ways. As a result, seed companies maintain quality control programmes that monitor seed from harvest to purchase. This is an open access article distributed under the terms of the Their growth habit is detrimental to the growing seed crop due to competing effect. being a internal feeder, the grubs feed on the internal contents of the seed or grain without notice until the adult weevil emerges out from the grain, which leads the grains in deterring the quality as well as reducing the vital processes of the seed such as germination etc,. Seedling vigor index based on seedling length, Table 2 Seed quality parameters as influenced by different genotypes in sorghum (Uninfested condition), *figures in the parenthesis are arcsine transformed values, Figure 1A Seed quality as influenced by different genotypes in sorghum, per cent germination. Studies on the seed quality parameters (germination percentage and seedling vigor index) of rabi sorghum seeds influenced by rice weevil infestation were carried out during 2012-13 at the Department of Agricultural Entomology, College of Agriculture, Bijapur, Karnataka. Jadhav K. Biology and management of Rice weevil. The maximum seedling vigor index was recorded in M 35-1(3448) in both uninfested and (2649) infested conditions and at the same there was reduction in germination by 0.54 per cent for every one per cent increase in population buildup of rice weevils and the values are significant at 5 per cent. Possession of good shape, size, colour, etc., according to specifications of variety. The seed quality test was conducted for infested and uniinfested seeds separately by adopting following methods (Table 1). Seed quality is a standard of excellence or an attribute that can determine the performance of the seed when planted or stored. Effect of insect infestation on stored grain–III. If you continue to use this site we will assume that you are happy with it. Their plant parts are poisonous or injurious to human and animal beings. Seeds of each variety/genotypes weighing 50g were kept in glass containers of 250g capacity separately for the investigation of grain damage by the pest. (Undamaged condition), Seedling vigor index of sorghum genotypes in uninfested condition. 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The grain damage and population buildup were assumed to one per cent when the grains were in damaged state, the correlation (r) was -0.49 and -0.54, indicating that, when there was one per cent increase in grain damage that leads in 0.49 per cent reduction in germination, whereas, there was reduction in germination by 0.54 per cent for every one per cent population buildup of weevils and both the values are significant at 5 per cent. 929 NW 164th Street, Edmond, OK 73013 (Mailing Address) More Locations, Roosevelt 7/ 8, Széchenyi István tér 7- 8C tower, 1051 - Budapest, MedCrave Group Kft, Email: support@medcrave.com, Toll free: +1 (866) 482 - 9988, Fax No: +1 (918) 917 - 5848, © 2014-2020 MedCrave Group Kft, All rights reserved. However under uninfested condition the genotypes Phule Revati (73.00%), Phule Vasudha (73.50%), 5-4-1(80.00%) and CSV 22(82.50%) have recorded significantly lower germination percentages where as under infested condition BR 33(54.50%), 5-4-1(56.50%), BJV 44(58.00%), CSV 22(61.00%), SMJ 1(66.00%) and CSV 18 (67.00%) have recorded minimum germination. The major seed quality characters are summarized as below. ©2018 Pradeep.. Keywords: sitophilus oryzae, rabi sorghum genotypes, germination, seedling vigor infested and uninfested condition, Sorghum (Sorghum bicolor (L.) Moench) is an important food and fodder crop of India and which ranks fourth after wheat, rice and maize and serving as a staple food for millions of people particularly in semi-arid tropics of the world. Five hundred grams of seed samples of above 20 sorghum genotypes were collected during rabi 2011-2012 to study per cent grain damage against S. oryzae under laboratory conditions. The data pertaining to the correlation between per cent germination to per cent grain damage and population buildup of rice weevil in sorghum grains in damaged condition infested by S. oryzae at 120days after storage are presented in the Table 4. Germination test was conducted as per the International Seed Testing Association (ISTA)3 procedure by adopting between paper method in a germinator maintained at 25-30°C and 95±3 per cent relative humidity in three replications each of 100seeds. Physical Quality: It is the cleanliness of seed from other seeds, debris, inert matter, diseased seed and insect damaged seed.
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