scholarly journals Pest status and population dynamics of the lucerne leaf beetle, Gonioctena fornicata (Brüggemann, 1873) (Coleoptera: Chrysomelidae), in a lucerne field in Adana Province, Turkey

2021 ◽  
Vol 45 (1) ◽  
pp. 41-51
Author(s):  
Ekrem ATAKAN ◽  
Yusuf DAĞ
Keyword(s):  
Population Dynamics ◽  
Leaf Beetle ◽  
Pest Status

scholarly journals Inter-seasonal population dynamics and pest status of Bemisia tabaci (Gennadius) biotype B in an Australian cropping system

2008 ◽  
Vol 99 (4) ◽  
pp. 325-335 ◽  
Author(s):  
R.V. Sequeira ◽  
A. Shields ◽  
A. Moore ◽  
P. De Barro
Keyword(s):  
Population Dynamics ◽  
Bemisia Tabaci ◽  
Cropping System ◽  
Late Summer ◽  
System Component ◽  
Cotton Production ◽  
Pest Status ◽  
Weed Host ◽  
Biotype B ◽  
Seasonal Population

AbstractBemisia tabaci, biotype B, commonly known as the silverleaf whitefly (SLW) is an alien species that invaded Australia in the mid-90s. This paper reports on the invasion ecology of SLW and the factors that are likely to have contributed to the first outbreak of this major pest in an Australian cotton cropping system. Population dynamics of SLW within whitefly-susceptible crop (cotton and cucurbit) and non-crop vegetation (sowthistle, Sonchus spp.) components of the cropping system were investigated over four consecutive growing seasons (September–June) 2001/02–2004/05 in the Emerald Irrigation Area (EIA) of Queensland, Australia. Based on fixed geo-referenced sampling sites, variation in spatial and temporal abundance of SLW within each system component was quantified to provide baseline data for the development of ecologically sustainable pest management strategies. Parasitism of large (3rd and 4th instars) SLW nymphs by native aphelinid wasps was quantified to determine the potential for natural control of SLW populations. Following the initial outbreak in 2001/02, SLW abundance declined and stabilised over the next three seasons. The population dynamics of SLW is characterised by inter-seasonal population cycling between the non-crop (weed) and cotton components of the EIA cropping system. Cotton was the largest sink for and source of SLW during the study period. Over-wintering populations dispersed from weed host plant sources to cotton in spring followed by a reverse dispersal in late summer and autumn to broad-leaved crops and weeds. A basic spatial source-sink analysis showed that SLW adult and nymph densities were higher in cotton fields that were closer to over-wintering weed sources throughout spring than in fields that were further away. Cucurbit fields were not significant sources of SLW and did not appear to contribute significantly to the regional population dynamics of the pest. Substantial parasitism of nymphal stages throughout the study period indicates that native parasitoid species and other natural enemies are important sources of SLW mortality in Australian cotton production systems. Weather conditions and use of broad-spectrum insecticides for pest control are implicated in the initial outbreak and on-going pest status of SLW in the region.

Effects of Regional Releases of Resistant Wheats on the Population Dynamics of the Cereal Leaf Beetle (Coleoptera: Chrysomelidae)1

1983 ◽  
Vol 76 (6) ◽  
pp. 972-980 ◽  
Author(s):  
E. P. Lampert ◽  
D. L. Haynes ◽  
A. J. Sawyer ◽  
D. P. Jokinen ◽  
S. G. Wellso ◽  
...  
Keyword(s):  
Population Dynamics ◽  
Leaf Beetle ◽  
Cereal Leaf Beetle

The Impact of Pubescent Wheat on the Population Dynamics of the Cereal Leaf Beetle 1 , 2

1976 ◽  
Vol 5 (1) ◽  
pp. 153-159 ◽  
Author(s):  
R. A. Casagrande ◽  
D. L. Haynes
Keyword(s):  
Population Dynamics ◽  
Leaf Beetle ◽  
Cereal Leaf Beetle ◽  
The Impact

Population dynamics, diet and pest status of the grassland melomys (Melomys burtoni) in northern Queensland sugarcane crops

2011 ◽  
Vol 38 (4) ◽  
pp. 330 ◽  
Author(s):  
Brendan C. Dyer ◽  
Anthony R. Clarke ◽  
Susan J. Fuller
Keyword(s):  
Population Dynamics ◽  
Pest Management ◽  
Habitat Type ◽  
Population Monitoring ◽  
Diet Analysis ◽  
Growth Stages ◽  
Pest Status ◽  
Closed Forest ◽  
Crop Development ◽  
Ipm Strategy

Context In far-northern Queensland, Melomys burtoni and M. cervinipes occur within sugarcane crops and adjacent habitats and are potentially damaging to sugarcane. Aims To examine the population dynamics and diet of Melomys spp. within sugarcane crops so that, in conjunction with cane-stalk damage assessments, their pest status could be determined and information provided relevant to the development of sustainable pest-management tools. Methods Eight sites within sugarcane fields, four adjacent to grassland and four adjacent to closed forest, were established around Tully in far-northern Queensland. We examined demographic characteristics of all rodents (the two Melomys spp. and Rattus sordidus) within the crops by capture–release studies. Snap-trapping and dissection studies, along with weed-biomass surveys, were conducted for diet analysis, whereas damaged stalk counts were undertaken to understand the damage process. Fieldwork commenced within a fully developed crop, then continued through the annual harvest period and all subsequent crop growth stages to the next harvest. Sampling was undertaken monthly from February 2005 to April 2006. Key results Melomys cervinipes was rarely caught in sugarcane and should not be regarded as a pest. In contrast, M. burtoni feeds on sugarcane and was responsible for damage to ~6% of stalks. In sites adjacent to closed forest, R. sordidus was found in higher numbers than was M. burtoni in Crop stages 2–4. However, at sites adjacent to grassland, numbers of M. burtoni increased in Crop stage 4, and before crop harvest, M. burtoni was found in higher numbers than was R. sordidus. M. burtoni colonised sugarcane at later stages of crop development than did R. sordidus. Although the level of M. burtoni reproduction was lower than that of R. sordidus, the highest proportion of pregnant M. burtoni individuals occurred during the later stages of crop development, corresponding directly with the highest proportion of juvenile recruitment. Conclusions Of the two Melomys species found in northern Queensland sugarcane crops, only M. burtoni should be regarded as a pest. This rodent breeds and feeds within the crop, primarily after canopy closure. M. burtoni captures were roughly equivalent irrespective of adjacent habitat type, whereas R. sordidus, the traditionally recognised major pest of sugarcane crops, was found in significantly higher numbers in sugarcane adjacent to closed forest. Implications The integrated pest-management (IPM) strategy developed for R. sordidus is centred on the early stages of crop development and includes population monitoring, in-crop weed control, harbourage management and strategic use of permitted rodenticides. The late colonisation and lower breeding potential of M. burtoni mean that the IPM strategy for R. sordidus will not be directly transferable to M. burtoni.

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