Prediction of adult western corn rootworm (Diabrotica virgifera virgifera LeConte) emergence

Středa, Tomáš; Vahala, O.; Středová, Hana

doi:10.17221/28/2012-pps

Cited by 5 publications

(2 citation statements)

References 16 publications

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“…2 as a cumulative sum of temperatures above 5 • C (SET5), is also important for prediction and signalization of poikilotherm organisms (pests). In connection with soil pest Western Corn Rootworm occurrence prediction, the hourly and daily soil sum of effective temperatures in the maize canopy in Czech Republic was evaluated by Středa et al (2013). Likewise, similar study was carried out in Switzerland by Derron et al (2005).…”

Section: Resultsmentioning

confidence: 99%

Specifics of soil temperature under winter wheat canopy

Krčmářová

Středová

Pokorný

et al. 2013

Contributions to Geophysics and Geodesy

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The aim of this study was to evaluate the course of soil temperature under the winter wheat canopy and to determine relationships between soil temperature, air temperature and partly soil moisture. In addition, the aim was to describe the dependence by means of regression equations usable for phytopathological prediction models, crop development, and yield models. The measurement of soil temperatures was performed at the experimental field stationŽabčice (Europe, the Czech Republic, South Moravia). The soil in the first experimental plot is Gleyic Fluvisol with 49-58% of the content particles measuring < 0.01 mm, in the second experimental plot, the soil is Haplic Chernozem with 31-32% of the content particles measuring < 0.01 mm. The course of soil temperature and its specifics were determined under winter wheat canopy during the main growth season in the course of three years. Automatic soil temperature sensors were positioned at three depths (0.05, 0.10 and 0.20 m under soil surface), air temperature sensor in 0.05 m above soil surface. Results of the correlation analysis showed that the best interrelationships between these two variables were achieved after a 3-hour delay for the soil temperature at 0.05 m, 5-hour delay for 0.10 m, and 8-hour delay for 0.20 m. After the time correction, the determination coefficient reached values from 0.75 to 0.89 for the depth of 0.05 m, 0.61 to 0.82 for the depth of 0.10 m, and 0.33 to 0.70 for the depth of 0.20 m. When using multiple regression with quadratic spacing (modeling hourly soil temperature based on the hourly near surface air temperature and hourly soil moisture in the 0.10-0.40 m profile), the difference between the measured and the model soil temperatures at 0.05 m was −2.16 to 2.37 • C. The regression equation paired with alternative agrometeorological instruments enables relatively accurate modeling of soil temperatures (R 2 = 0.93).

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Section: Resultsmentioning

confidence: 99%

Specifics of soil temperature under winter wheat canopy

Krčmářová

Středová

Pokorný

et al. 2013

Contributions to Geophysics and Geodesy

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“…The warm climate, low altitude and soil conditions allow for the complete adult WCR development since the initial decade of Julybefore the 190 th day (09. July) of the year (Středa et al, 2013). Winter 2008/2009 was the coldest of the last three winters.…”

Section: Discussionmentioning

confidence: 99%

Development of the Western corn rootworm, Diabrotica virgifera virgifera in soil

Cagáň¹,

Števo²,

Peťovská³

2016

j. cent. eur. agric.

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Monitoring of developmental stages of the Western corn rootworm (WCR) (Diabrotica virgifera virgifera) is an important aspect of its control. In the experiment there were analysed randomly selected plants of maize on six localities in western Slovakia, in the years 2008-2010 a 2014-2015. The aim of the study was to identify exact time of the emergence of the WCR adults in the consequence of different years and different localities and to find the best date for their eradication. The most of the WCR individuals at the northern locality were observed on 29 June and the first adults were found on 07 June, during colder year 2006. The development started about nine days earlier in the next year in southern Slovakia, because of extremely hot weather. The population of pest increased slower in 2008 than in previous years, and the highest appearance was monitored up-to 02 July. The first adults were monitored on 27 June in the years 2009-2010 as well as 2014-2015. Generally, the highest numbers of the first instar larvae were observed on 22 June at the locality Čiližská Radvaň. The second instar larvae and the most of adults was found on 20 June in Sokolce. On 29 June it was monitored the largest amount of the third instar larvae at the locality Čiližská Radvaň. The differences in the time of the emergence of adults depended on the year. Based on the monitoring in Slovakia, it can be expected the third instar larvae from second decade of June and the first adults in the last decade of June and in the first decade of July.

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