Impact of Host Plant Phenology on the Population Dynamics and Oviposition of Northern Corn Rootworms, Diabrotica barberi (Coleoptera: Chrysomelidae), in Field Corn

1988 ◽  
Vol 17 (3) ◽  
pp. 508-521 ◽  
Author(s):  
Steven E. Naranjo ◽  
Alan J. Sawyer
Keyword(s):  
Population Dynamics ◽  
Host Plant ◽  
Plant Phenology ◽  
Diabrotica Barberi ◽  
Field Corn ◽  
Corn Rootworms

SEQUENTIAL SAMPLING OF ADULT NORTHERN AND WESTERN CORN ROOTWORMS (COLEOPTERA: CHRYSOMELIDAE) IN SOUTHERN ONTARIO

1987 ◽  
Vol 119 (6) ◽  
pp. 577-585 ◽  
Author(s):  
H.J. McAuslane ◽  
C.R. Ellis ◽  
O.B. Allen
Keyword(s):  
Negative Binomial ◽  
Sequential Sampling ◽  
Ratio Test ◽  
Economic Threshold ◽  
Diabrotica Barberi ◽  
Southern Ontario ◽  
Sampling Plans ◽  
Field Corn ◽  
Corn Rootworms ◽  
Sequential Probability

AbstractThree sequential-sampling plans were developed for adult Diabrotica barberi Smith and Lawrence and D. virgifera virgifera LeConte in field corn in southern Ontario. The distribution of both species was well approximated by the negative binomial distribution and obeyed Taylor’s power law. Two plans, following the methods of Kuno (1969) and Green (1970), estimated populations with predetermined precision. The third plan, based on Wald’s (1947) sequential probability ratio test, categorized populations relative to an economic threshold. Different sequential-sampling plans were constructed for 1st-year fields and for all other fields because the parameter k, measuring the extent of aggregation of the beetles, differed between these two classes of fields. Decision equations for Wald’s plan in 1st-year fields were: D1 = 0.98n − 17.75 and D2 = 0.98n + 13.82. Decision equations for 2nd-year or older fields were: D1 = 0.99n − 13.42 and D2 = 0.99n + 10.45. The use of Wald’s plan reduced the required sample size by 55% in 1st-year fields, and by 48% in all other fields. The savings associated with the other sequential-sampling plans were not significant.

THE EFFECTS OF HOST-PLANT GENOTYPE ON HERBIVORE POPULATION DYNAMICS

Ecology ◽  
2000 ◽  
Vol 81 (6) ◽  
pp. 1565-1576 ◽  
Author(s):  
Nora Underwood ◽  
Mark D. Rausher
Keyword(s):  
Population Dynamics ◽  
Host Plant ◽  
Plant Genotype

Maternal effects in an insect herbivore as a mechanism to adapt to host plant phenology

2010 ◽  
Vol 24 (5) ◽  
pp. 1103-1109 ◽  
Author(s):  
Margriet van Asch ◽  
Riita Julkunen-Tiito ◽  
Marcel E. Visser
Keyword(s):  
Host Plant ◽  
Maternal Effects ◽  
Plant Phenology ◽  
Insect Herbivore

Host plant phenology, insect outbreaks and herbivore communities – The importance of timing

2019 ◽  
Vol 89 (3) ◽  
pp. 829-841
Author(s):  
Adam Ekholm ◽  
Ayco J. M. Tack ◽  
Pertti Pulkkinen ◽  
Tomas Roslin
Keyword(s):  
Host Plant ◽  
Plant Phenology ◽  
Insect Outbreaks ◽  
Herbivore Communities

scholarly journals Effects of Citrus Overwintering Predators, Host Plant Phenology and Environmental Variables on Aphid Infestation Dynamics in Clementine Citrus

2019 ◽  
Vol 112 (4) ◽  
pp. 1587-1597 ◽  
Author(s):  
Juan Pedro Raul Bouvet ◽  
Alberto Urbaneja ◽  
César Monzó
Keyword(s):  
Biological Control ◽  
Host Plant ◽  
Natural Enemies ◽  
Environmental Variables ◽  
Aphis Gossypii ◽  
Colony Growth ◽  
Plant Phenology ◽  
Conservation Strategies ◽  
Phenological Stages ◽  
Aphid Infestation

Abstract The Spirea citrus aphid, Aphis spiraecola Patch, and the cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae), are key pests of clementine mandarines in the Mediterranean basin. Severity of aphid infestations is determined by environmental variables, host plant phenology patterns, and the biological control exerted by their associated natural enemies. However, there is no information about the role these limiting and regulating factors play. Aphid densities, citrus phenology, and associated predators that overwinter in the crop were monitored weekly throughout two flush growth periods (February to July) in four clementine mandarin groves; relationships between these parameters and environmental variables (temperature and precipitation) were studied. Our results show exponential increase in aphid infestation levels to coincide with citrus phenological stages B3 and B4; shoots offer more space and nutritional resources for colony growth at these stages. Duration of these phenological stages, which was mediated by mean temperature, seems to importantly determine the severity of aphid infestations in the groves. Among those studied, the micro-coccinellids, mostly Scymnus species, were the only group of predators with the ability to efficiently regulate aphid populations. These natural enemies had the highest temporal and spatial demographic stability. Aphid regulation success was only achieved through early presence of natural enemies in the grove, at the aphid colonization phase. Our results suggest that conservation strategies aimed at preserving and enhancing Scymnus sp. populations may make an important contribution to the future success of the biological control of these key citrus pests.

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