Influence of host-plant density and male harassment on the distribution of female Euphydryas anicia (Nymphalidae)

Oecologia ◽  
1989 ◽  
Vol 78 (2) ◽  
pp. 283-288 ◽  
Author(s):  
F. J. Odendaal ◽  
P. Turchin ◽  
F. R. Stermitz
Keyword(s):  
Host Plant ◽  
Plant Density ◽  
Male Harassment ◽  
Euphydryas Anicia ◽  
Host Plant Density

Stem borer damage in maize as affected by host plant density

1981 ◽  
Vol 96 (3) ◽  
pp. 695-697 ◽  
Author(s):  
E. O. Ogunwolu ◽  
K. Nwosu ◽  
S. O. Ogunyebi
Keyword(s):  
Host Plant ◽  
Plant Density ◽  
Stem Borer ◽  
Pest Population ◽  
Current Standard ◽  
Research Attention ◽  
Small Areas ◽  
Collective Effort ◽  
Host Plant Density ◽  
Maize Grain

Maize grain production in Nigeria is the collective effort of several growers individually cropping small areas. In these farms, maize stands are at suboptimal densities, soil fertility is low and crop loss from pests is high. Consequently, grain yields are characteristically low. By planting maize at closer spacing than the current standard, 90 x 25 cm, Fayemi (1963), Chinwuba (1967), and Okigbo (1972) were able to raise grain yield. However, the effect on pest population in Nigeria of increasing host plant density has received little research attention. Cromartie (1975) showed that host plant density and arrangement affect insect population dynamics. Other reports by Ficht (1932), Finch & Skinner (1976), Ralph (1977), Zepp & Keaster (1977), Adesiyun (1978) and Mayse (1978) indicate differential insect colonization, establishment and damage on host plants sown at different densities.

scholarly journals Influence of Vitellaria Paradoxa Gaertn Depletion on the Incidence, Abundance and Distribution of Cirina Forda Westwood (Lepidoptera: Saturniidae) in Niger State, Nigeria

2019 ◽  
Vol 35 (1) ◽  
pp. 31-43
Author(s):  
M. I. Muhammad ◽  
A. T. Ande
Keyword(s):  
Host Plant ◽  
Plant Density ◽  
Seasonal Abundance ◽  
Shea Butter ◽  
Vitellaria Paradoxa ◽  
Cirina Forda ◽  
Host Plant Density ◽  
Cropping Seasons ◽  
Abundance And Distribution ◽  
Cluster Abundance

The pallid emperor moth, Cirina forda, is a prominent edible insect in Niger State but currently at great risk of extinction. The incidence, abundance and distribution of Cirina forda, was investigated for four consecutive seasons, i.e. May-June 2010, 2011, 2012 and 2013 to ascertain the effect of the depletion of its host plant, Shea butter trees, Vitellaria paradoxa. in Niger State, Nigeria. C. forda egg clusters located on the host plants were enumerated to ascertain the seasonal abundance by visual counting using hand lenses and binoculars (MARCO-model 750/8 m-988000 m). At each location, 100m2 land area in which three 10m2 portions were mapped as replicate sites, were investigated for host plant density, egg cluster abundance and distribution within three host plant canopy height ranges. The 41 locations in six Local Government Areas (LGAs) where C. forda occurred in Niger State in 2010 were investigated. The result indicated the GPS of each of the locations and showed that Niger state had a very rich but fast dwindling population of V. paradoxa. C. forda egg cluster abundance across the six LGAs showed Niger state as highly endowed but ephemeral and highly unpredictable, especially in terms of location where they occurred. The egg cluster abundance reduced drastically from 58.1± 12.1 and 56.1±24.1 egg cluster/host plant in 2010 and 2011, respectively to 41.3 ± 8.3 and 29.7 ±5.1 egg cluster/host plant in 2012 and 2013 cropping seasons, respectively. Locational similarities were observed in the trends of C. forda host plant density reduction and egg cluster abundance over the four cropping seasons and these were corroborated across the State. The decreasing densities of Shea butter trees was identified as posing serious threats to egg laying by C. forda. The possibility of the extinction of C. forda was identified as imminent and a conservation approach that stems the indiscriminate destruction of host tree, V. paradoxa (Shea butter trees) was proposed.

Nematode-induced galls inMiconia albicans: effect of host plant density and correlations with performance

2012 ◽  
Vol 28 (1) ◽  
pp. 63-69 ◽  
Author(s):  
LEONARDO RODRIGO VIANA ◽  
FERNANDO AUGUSTO OLIVEIRA SILVEIRA ◽  
JEAN CARLOS SANTOS ◽  
LUIZ HENRIQUE ROSA ◽  
JUVENIL E. CARES ◽  
...  
Keyword(s):  
Host Plant ◽  
Plant Density ◽  
Host Plant Density
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