Samaru Journal Of Agricultural Education
Volume No: 7|
ISSN: 0794 – 7860|
| FullText PDF
Title: Screening Sunflower (Helianthus annuus L.)Accessions for Resistance to
Dysdercus volkeri F. (Pyrrhocoridae: Heteroptera) at Samaru, Zaria,
, I. Onu
, R.S. Adamu
, U Ahmed, I.A.; Magaji, B.T.; Ubale, M. A.;
SAMARU COLLEGE OF AGRICULTURE, ABU ZARIA. DEPARTMENT OF CROP PROTECTION, ABU ZARIA.
SCHOOL OF AGRICULTURAL TECHNOLOGY, NUHU BAMALLI POLYTECHNIC ZARIA.
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.