Spatial distribution and sequential sampling plans for adult Sitona humeralis Stephens (Coleoptera: Curculionidae) in alfalfa

Arbab, Abbas; McNeill, M.R.

doi:10.1016/j.aspen.2014.04.009

Cited by 13 publications

(9 citation statements)

References 16 publications

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“…Moreover, the sample size fluctuated between seasons, precision level required and density of pod borer larvae. Similar type of optimal sample size fluctuation has also been reported for other insect pests such as Sitonia humeralis in alfalfa (Arbab and McNeill 2014), Megacopta cribraria in soybean (Stubbins et al 2014). Optimal sample size also varies between generations of a particular species (Ifoulis and Savopoulou-Soultani 2006).…”

Section: Optimal Sample Sizesupporting

confidence: 66%

Incidence and within field dispersion pattern of pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) in chickpea in Ethiopia

Damte

Ojiewo

2017

Archives of Phytopathology and Plant Protection

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Podborer is a major pest of chickpea in Ethiopia. Field surveys were conducted in 2013/2014 and 2014/2015 in central and northwestern Ethiopia to assess the prevalence and within field distribution of the pest. Although podborer was prevalent throughout the surveyed areas, there was a significant difference in larval density (0.10-3.75 larvae per m 2) among zones and districts within zones. This variation was attributed to cropping history, cropping patterns, chickpea-crop adjacency, and weather (rainfall and temperature) conditions before and during the season as well as control measures applied. The optimum sample size required for precision ranged from 98, when podborer density was 10/m 2 , to 1045, when podborer density was ≤1/m 2. Within field distribution of the larvae fitted a negative binomial distribution indicating that the larvae had a clumped/aggregated dispersion pattern. These results will enable chickpea stakeholders to develop and apply appropriate integrated crop management techniques for the control of podborer.

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Section: Optimal Sample Sizesupporting

confidence: 66%

Incidence and within field dispersion pattern of pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) in chickpea in Ethiopia

Damte

Ojiewo

2017

Archives of Phytopathology and Plant Protection

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“…Various data sets (corresponding to observations made on different sampling dates) from each field were used, as in other studies of H. armigera or H. zea , e.g., [ 13 , 16 , 17 , 37 ] or other pests, e.g., [ 47 , 53 , 54 ]. Tomato fruitworm has at least three generations in the Ribatejo region and is a strong-flying insect, highly migratory, and highly polyphagous; therefore, we assumed the data sets to be independent, and regression for estimation of the TPL parameters could be carried out.…”

Section: Methodsmentioning

confidence: 99%

Risk Assessment for Tomato Fruitworm in Processing Tomato Crop-Egg Location and Sequential Sampling

Figueiredo

Gonçalves

Duarte

et al. 2020

Insects

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Helicoverpa armigera is one of the key pests affecting processing tomatoes and many other crops. A three-year study was conducted to describe the oviposition preferences of this species on determinate tomato plants (mainly the stratum, leaf, leaflet, and leaf side) and the spatial pattern of the eggs in the field, to form a sequential sampling plan. Eggs were found mainly in the exposed canopy, on leaves a (upper stratum) and b (upper-middle stratum) and significantly fewer eggs on leaf c (middle-lower stratum) below flower clusters. This vertical pattern in the plant was found in all phenological growth stages. The spatial pattern was found to be aggregated, with a trend towards a random pattern at lower densities. A sequential sampling plan was developed, based on Iwao’s method with the parameters of Taylor’s power law, with minimum and maximum sample size of 20 and 80 sample units (plants), respectively (two leaves/plant). For its validation, operating characteristic (OC) and average sample number (ASN) curves were calculated by means of simulation with independent data sets. The β-error was higher than desirable in the vicinity of the economic threshold, but this sampling plan is regarded as an improvement both in effort and precision, compared with the fixed sample plan, and further improvements are discussed.

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“…Many burying beetles got into the traps throughout the entire season. Two peaks of carabids seasonal activity have been identified, associated with the emergence of the summer generation, abundance of insect pests and by the hydrothermal conditions, in the phases of Galéga orientalis full flowering and beginning of ripening (Arbab, McNeill, 2009). The peaks were shifted in time depending on the weather conditions for over 14 days per year (Table 4).…”

Section: Phytocenoses Dominated By Galéga Orientalismentioning

confidence: 99%

Spatio-temporal Distribution of Entomophages in Phytocenoses of Anthropogenically Modified Landscape in the Forest-steppe of Western Siberia

Toropova¹,

Marmuleva²,

Осинцева³

et al. 2016

Biosci., Biotech. Res. Asia

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The research was aimed at identifying the characteristics of spatiotemporal distribution of entomophages in the herb and the aboveground layers in phytocenoses of agricultural landscape of the Northern forest-steppe of Western Siberia. Based on the analysis of the structure of entomocomplexes of phytocenoses with various types of flowering and frequency of anthropogenic successions (herbs dominated by Galéga orientalis, and adjacent phytocenoses of Vicia faba and Brassica napus), the similarity of the taxonomic composition of major entomophages and changes in the ratios in favor of phytophages in phytocenoses of cultivated crops has been shown. The close dependence of the number of insects on the hydrothermal conditions of vegetation conditions has been revealed. Biodiversity of entomocomplex in herbs has been veraciously higher, as compared to Vicia faba and Brassica napus, the total number of insects was maximum in the phytocenosis of fava beans due to the manifold increased domination of phytophages. The importance of preserving the sites with flowering plants as donors of natural entomophages has been proven. Their wide food chains ensure stabilization in the number of pests on annual crops that belong to different botanic families. The entomophagous complex underwent significant changes during migrations, carabids featured higher relative abundance in the agroecosystems of Vicia faba and Brassica napus, the level of dominance of entomophages in the herbs level remained at the level of phytocenosis of Galéga orientalis, ensuring natural regulation of phytophages population.

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Spatial distribution and sequential sampling plans for adult Sitona humeralis Stephens (Coleoptera: Curculionidae) in alfalfa

Cited by 13 publications

References 16 publications

Incidence and within field dispersion pattern of pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) in chickpea in Ethiopia

Incidence and within field dispersion pattern of pod borer, Helicoverpa armigera (Lepidoptera: Noctuidae) in chickpea in Ethiopia

Risk Assessment for Tomato Fruitworm in Processing Tomato Crop-Egg Location and Sequential Sampling

Spatio-temporal Distribution of Entomophages in Phytocenoses of Anthropogenically Modified Landscape in the Forest-steppe of Western Siberia

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