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Samaru Journal Of Agricultural Education

Year: 2016|   Volume No: 7|   ISSN: 0794 – 7860|   Page No: 


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Title:  Screening Sunflower (Helianthus annuus L.)Accessions for Resistance to Dysdercus volkeri F. (Pyrrhocoridae: Heteroptera) at Samaru, Zaria, Nigeria
U. Mani , I. Onu , R.S. Adamu ,U. Malik , U Ahmed, I.A.; Magaji, B.T.; Ubale, M. A.; Nuradeen Musa

SAMARU COLLEGE OF AGRICULTURE, ABU ZARIA. DEPARTMENT OF CROP PROTECTION, ABU ZARIA. SCHOOL OF AGRICULTURAL TECHNOLOGY, NUHU BAMALLI POLYTECHNIC ZARIA.

ABSTRACT

Experiments were conducted at the Institute for Agricultural Research (IAR) irrigation farm in 2008 and 2009. The objectives were to screen nine accessions of sunflower for damageand determine the effects of feedingby D. volkeri. These included PI 267665, Trad 10, Ames 3236, Ames 1838, Ames 3390, PI 193775, PI 176974, PI 298632 and Funtua. The experiment consisted of five treatments in a randomized complete block design which was replicated three times with the population of zero, ten, ten, ten, ten caged pairs of the insects respectively. Insects count, seed damage, lipid content, acid value and yield were computed for each sunflower accession. The result of the studies indicated a significant difference (P<0.05) on the number of the bugs on the crop. The number of D. volkeri can serve as an index to the preference of the crop to the bug. Combined analysis indicated that accessions PI 267665, Ames 3236, and Ames 1838 had more insects during the studies in both free and no choice experiments with a damage rating 5 indicating that it was highly susceptible to the bug. Accessions PI 298632, Funtua, Ames 3236 and PI176974 showed resistance to D. volkeri damage. On lipid value, the result indicated significant difference among the Accessions. Ames 3236, PI 176974, PI 193775 and Funtua recorded the highest lipid percentage of 41%, 46%, 44% and 41% respectively. Similarly, the accessions that recorded the highest fatty acid value were Ames 1838 with 0.90mg/100 ml. On yield, the result showed significant difference (P<0.05) among accessions though Funtua and PI 298632 were found to have the highest yield of 1282 and 1283 kg/ha respectively.

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