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Articles by G.O. Ihejirika
Total Records ( 6 ) for G.O. Ihejirika
  G.O. Ihejirika
  Cowpea (Vigna unguiculata L.) pods or grains could be stored in warehouse, silos, cribs, steel drums, rombus, earthen ware pots, plastic or gourds. A test was conducted to evaluate storage materials and varietal differences on some fungal diseases and germination of cowpea. It was found that cowpea stored in earthen pot recorded lowest percentage occurrence of Anthracnose followed by those stored in jute, when those stored in plastic bag recorded highest. IAR1696 and IT89KD-374 recorded similar but low percentage occurrence of Anthracnose in all the storage materials investigated. These varieties recorded similar but lowest percentage germination in all the storage materials when IT89KD-374 and IT93K-452-1 recorded but highest percentage germination. Cowpea stored in jute recorded highest mean percentage germination (89.2), when those stored in plastic bag recorded lowest 75.8%. Cowpea variety IT89KD-288 recorded lowest percentages germination irrespective of the storage material used, when other varieties recorded higher but similar percentages germination which fall with the range of 83.6-85.4. Investigation revealed that storage materials influence some fungal diseases development as well as the viability of the seed as determined by its germination percentage. On the other hand there were varietal influences on the percentage occurrence of some fungal diseases as well as germination of cowpea.
  G.O. Ihejirika , M.I. Nwufo , E. Oputa , O.P. Obilo , K.O. Ogbede and V.N. Onyia
  Groundnut (Arachis hypogeae L.) is a well know oil-seed crop grown as food for man and feed for animals. It is mostly grown in the savannah region with little cultivation in the forest south. A two season experiments was conducted in 2003 and 2004 respectively, to determine the effects of NPK fertilizer rates and plant population on foliar diseases, insect damage and yield of groundnut. Analysis of variance indicated that NPK fertilizer rates significantly influence foliar disease development with leafspot disease (Cercospora arachidicola Hori) (4.618, 4.326) being highest, followed by rust (3.214, 3.013), with seedling blight (2.90; 3.015) being lowest in 2003 and 2004, respectively. 0 kg ha -1 (control) recorded highest in all these foliar diseases investigated, when 130 kg ha -1 recorded lowest development of these foliar diseases. Plant population was significant in these foliar diseases. 1,000,000 plants per hectare, recorded highest foliar diseases development when 250, 000 plants ha -1 had the lowest in all the seasons investigated. Interaction of NPK and plant population was significant on leafspot disease (3.86, 2.70), rust (2.55, 2.00) and seedling blight (1.76, 1.85) in 2003 and 2004 respectively. 0kg ha -1 recorded lowest seed yield, but highest insect damage while 130 kg ha -1 had highest seed yield (tons ha -1 ) (3.56, 3.23) but lowest insect damage (3.28, 2.96) in 2003 and 2004 respectively. Also foliar diseases development increased with plant age.
  G.O. Ihejirika , M.I. Nwufo , C.I. Duruigbo , E.U. Onwerenadu , O.P. Obilo , E.R. Onuoha and K.O. Ogbede
  A two season Experiment was conducted during the rainy seasons of 2003 and 2004 respectively, to determine the effects of plant extracts and plant density on the severity of leafspot disease and yield of groundnut Cercospora arachidicola Hori in Imo State. Analysis of variance indicated that plant extract was significant on leafspot disease severity and seed yield (kg ha-1) 110.05, 107.85 in 2003 and 2004. Similarly, plant density was highly significant on leafspot disease severity and seed yield (kg ha-1) 91.15, 88.36. Azadirachta indica spray recorded lowest leafspot disease severity while no spray (control) recorded highest. Plant density (10x10) cm recorded highest leafspot disease severity while (40x40) cm had the lowest. Also Azadirachta indica spray recorded the lowest seed yield (kg ha-1) 18.06; 17.08. Plant density of (10x10) cm recorded the lowest seed yield (kg ha-1) 16.22, 15.19, while (20x20) cm recorded highest seed yield (kg ha-1) 22.40; 20.69. leafspot disease severity increased with plants age.
  G.O. Ihejirika , M.I. Nwufo , M.C. Ofoh and V.N. Onyia
  Maize (Zea mays L.) is a well-known cereal grain grown in the savannah rejoin as well as in the rain forest zone of the country. Experiments were conducted during the rainy season of 2004 and 2005 to determine the effects of mulch material and plant density on some fungal diseases and yield of maize. Analysis of variance indicate that mulch material was significant on leaf spot disease 1.66;1.45, Blight 1.10; 1.04, Rust 0.012; 0.050 and grain yield 0.55; 0.63 tons/ha in 2004 and 2005, respectively. Grass mulch recorded highest plant height 90.10; 89.73 followed by live mulch 70.81; 76.60 when no mulch (control) recorded the lowest plant height 56.25; 57.74. Same trend was observed on grain yield. Grass mulch had 1.20; 1.23 when control recorded lowest 1.00; 0.87 in 2004 and 2005, respectively. Plant density was significant on plant height, 546; 493.07, grain yield 2.65; 2.31, leaf spot disease severity 0.40; 0.12 and rust 2.96; 3.20. 25x75 cm recorded highest in plant height 82.30; 79.88, grain yield 1.65; 1.42 as well as leaf spot disease severity 1.52; 1-33, blight 1.62; 1.85 and rust 1.65; 1.43 when 75x75 cm had lowest plant height as well as the diseases investigated and the fungi observed were Heliminthosprum sp. Puccinia spp and Aspergillus link in 2004 and 2005, respectively.
  G.O. Ihejirika
  Two field experiments were carried out during the early seasons of 2000 and 2001, to examine the effect of organic manure applied as zero manure, green manure and fowl droppings respectively and plant densities of 1,000,000; 250,000; 111,111 and 62,500 plants ha-1, respectively in 2000 and 2001, respectively on pod rot, nodulation and 1000-seed weight of groundnut. The result showed that manure and plant density were highly significant (p< 0.01) on pod rot, nodulation and 1000-seed weight in 2000 and 2001, respectively. Organic manure significantly reduced pod rot 4.31 and 4.47 in 2000 and 2001, respectively. Fowl dropping reduced severity of pod rot 3.10; 3.02 in comparison with green manure 4.72; 4.86 when zero manure (no-treatment) 5.10; 5.54 in 2000 and 2001, respectively were high. Two hundred and fifty thousand plants ha-1 recorded least severity of pod rot 3.00; 2.77 while 1,000,000 plants ha-1 4.95; 4.50 were high in 2000 and 2001, respectively. Organic manure were highly significant on nodulation 9.60; 9.48 in 2000 and 2001, respectively with fowl dropping 15.10; 14.75 recording highest, when zero-manure (control) 10.84; 11.16 nodulation per plant were low in 2000 and 2001, respectively. Organic manure and plant density were highly significant (p< 0.01) on 1000-seed weight with organic manure 641.1; 642.9 and plant density 812.2; 799.2 in 2000 and 2001, respectively. Fowl dropping recorded highest 1000-seed weight 672.5; 680.0 as well as 250,000 plants ha-1 895.5; 863.4 while 1,000,000 plants ha-1 recorded the lowest 1000-seed weight 752.0; 785.0 in 2000 and 2001, respectively.
  G.O. Ihejirika , M.I. Nwufo , C.I. Durugbo , I.I. Ibeawuchi , V.H. Onyia , E.U. Onweremadu and P.N. Chikere
  Storage studies of groundnut (Arachis hypogeae L) in South B Eastern Nigeria were conducted to find out the rate of rot disease and the fungi responsible for the disease. Twenty-five storage locations were investigated. They were seriously infected with rot disease. On isolation on Potalo Dextrose Agar, the injected material yielded three different fungi all of which were Aspergillus flavus link. 60% of the fungi were Aspergillus niger Van Tiegh, 25% Aspergillus versicolor (Vuill) Tirab. While Aspergillus fresen was 15%. The Aspergillus niger Van Tiegh was 5-6 cm with brownish colour at center and whitish at edge. A. versicolor (Vuill) Tirah was 4-5 cm still with brownish colour but shades of white at edge while A. fresen was 3.5-4 cm with light brown at center and whitish at edges.
 
 
 
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