Evaluating Western Corn Rootworm (Coleoptera: Chrysomelidae) Emergence and Root Damage in a Seed Mix Refuge

2010 ◽  
Vol 103 (1) ◽  
pp. 147-157 ◽  
Author(s):  
A. F. Murphy ◽  
M. D. Ginzel ◽  
C. H. Krupke
Keyword(s):  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage

scholarly journals Effects of the Low-Level Western Corn Rootworm Egg Infestation on Maize Plants in the Field

2019 ◽  
Vol 68 (1-2) ◽  
pp. 28-33
Author(s):  
Branka Popović ◽  
Snežana Tanasković ◽  
Sonja Gvozdenac
Keyword(s):  
Statistical Analysis ◽  
Plant Height ◽  
Root Zone ◽  
Western Corn Rootworm ◽  
Root Weight ◽  
Corn Rootworm ◽  
Root Damage ◽  
Number Of Leaves ◽  
Maize Plants ◽  
Positive Correlations

Summary From the economic perspective, the western corn rootworm (WCR), Diabrotica virgifera sp. virgifera (Col., Chrysomelidae), poses the gravest threat to the field maize production in Serbia. The purpose of this study is to examine the impact of WCR larvae on the morphology of maize characters during a low-level artificial egg infestation. A field experiment involving the Serbian cultivar ‘NS-640’ was carried out in Bečej, Vojvodina Serbia, in 2016. In the experimental field, a total of 96 maize plants were selected, marked and arranged in 48 pairs. Each pair consisted of an infested plant (WCR eggs injected in the root zone) and an uninfested plant (distillate water injected in the root zone). The number of leaves, height and stem diameter of the plants observed were recorded. Root damage and root weight were measured and evaluated at the end of the trail. For the purpose of statistical analysis, the non-parametric Kruskal-Wallis one-way analysis of variance and a correlation matrix were used. The statistical analysis performed indicate a highly significant difference in the number of leaves and plant height between the infested and uninfested maize plants examined in July (the third field observation). During the last field inspection, significant differences were recorded only between the stem diameters of the infested and uninfested maize plants. A negative correlation was found to exist between the root damage and root weight of the plant pairs. There were positive correlations between the stem diameter, plant height and number of leaves of the infested plants, whereas positive correlations were found between the root damage and plant height of the uninfested plants.

Root Damage by Western Corn Rootworm and Nutrient Content in Maize 1

1985 ◽  
Vol 77 (5) ◽  
pp. 769-774 ◽  
Author(s):  
A. L. Kahler ◽  
A. E Olness ◽  
G. R. Sutter ◽  
C. D. Dybing ◽  
O. J. Devine
Keyword(s):  
Nutrient Content ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage

scholarly journals Control of Western Corn Rootworm Larvae in West Central Nebraska, 1992

1994 ◽  
Vol 19 (1) ◽  
pp. 209-209
Author(s):  
R. C. Seymour ◽  
J. B. Campbell ◽  
R. J. Wright
Keyword(s):  
Growth Stage ◽  
Rating Scale ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage ◽  
Time Of Application ◽  
Field Corn ◽  
West Central ◽  
The Press ◽  
Corn Plants

Abstract Granular insecticides were applied to suppress larval rootworm populations in 2 fields in west central NE. ‘Pioneer 3394’ hybrid field corn was ridge-planted in Field 1 with a John Deere Max-emerge planter, to a non-tilled seed bed on 11 May. Insecticides were applied at planting with insecticide boxes attached to the planter. Three replications of each treatment were arranged in a RCB design. T-band applications were made by applying a 7 inch band of insecticide in front of the press wheel. In-furrow applications were made by applying insecticide directly into the seed furrow. All insecticides were applied at a rate of 1114.5 g (AI)/ha. Field 2 was ridge-planted to ‘Fontanelle 4435’ and ‘Fontanelle 6240’ hybrid field corn with a John Deere Max-emerge planter, to a non-tilled seed bed on 6 May. With the exception of 4 strips, 12 rows in width, Counter 15G was applied at planting with insecticide boxes on the planter at a rate of 1114.5 g (AI)/ha. A granular and a liquid insecticide were applied to untreated strips in Field 2 immediately prior to cultivation on 15 Jun. The field corn plants were in the early whorl stage (growth stage 2) of development at the time of application. The granular application was applied over the whorl of the plants with insecticide boxes attached to a tool bar. The liquid insecticide was applied in a 7 inch band to the base of the plants in total volume of 120 liter/ha at 206,786 Pa (30 psi). Cultivation treatments were applied at a rate of 1114.5 g (AI)/ha. Each treatment in Field 2 was applied to 10 × 4 m plots which were replicated 4 times and arranged in a RCB design. Two blocks of treatments were applied to ‘Fontanelle 4435’ hybrid field corn plants and 2 blocks of treatments were planted to ‘Fontanelle 6240’ hybrid field corn plants. Treatments in both fields were evaluated 13 Jul by rating washed roots, using the 1-6 Iowa Root Damage Rating Scale, of 4 plants from each replicate.

scholarly journals Maize hybrid and nutrient specific evaluation of the population dynamics and damage of the western corn rootworm (Diabrotica Virgifera Virgifera LeConte) in a long-term field experiment

2020 ◽  
Author(s):  
Árpád Illés ◽  
Csaba Bojtor ◽  
Seyed Mohammad Nasir Mousavi ◽  
L. Csaba Marton ◽  
Péter Ragán ◽  
...  
Keyword(s):  
Female Flower ◽  
Diabrotica Virgifera Virgifera ◽  
Nutrient Supply ◽  
Western Corn Rootworm ◽  
Egg Laying ◽  
Corn Rootworm ◽  
Root Damage ◽  
Potential Threat ◽  
Nitrogen Levels

AbstractAgricultural production is threatened by different invasive species, as their damage results in a serious loss of income. The aim of the research was the assessment of the swarming dynamics and damage of the western corn rootworm (WCR) adults and larvae. The experiment was carried out in monoculture fertilization long-term experiments and three maize hybrids compared for their reaction against WCR adult and larval damage under non-infested plots at different nitrogen levels. Differences among the hybrids have a lower effect on the damage of corn rootworm adults and larvae than the amount of applied nitrogen. The phosphorus-potassium are optimal levels, while nitrogen ranges from 0 to 300 kg and no nutrient supply took place in the control plots for 30 years. The number of adults located and feeding on the styles of the female flower recorded and the damage caused on the roots by larvae ranked on a modified Iowa scale. Nitrogen fertilization resulted in a change in the silking time. The lowest root damage observed in the case of the high nutrient treatment with an Iowa value of 3.18. The coincidence of the nourishment of adults and the egg-laying time with silking is a potential threat in terms of fertility. Based on the results, it found that the extent of root damage can be reduced through the optimal selection of the time and dose of nutrient supply, primarily that of nitrogen. In general, both larvae and adults can cause severe yield loss, but the method of control against them is different. The coincidence of the nourishment of adults and the egg-laying time with silking is a potential threat in terms of fertility.

Risk of Western Corn Rootworm (Coleoptera: Chrysomelidae) Damage to Continuous Corn in Virginia

1997 ◽  
Vol 32 (3) ◽  
pp. 281-289 ◽  
Author(s):  
Thomas P. Kuhar ◽  
Roger R. Youngman ◽  
Curtis A. Laub
Keyword(s):  
Economic Loss ◽  
Diabrotica Virgifera Virgifera ◽  
Western Corn Rootworm ◽  
Corn Rootworm ◽  
Root Damage ◽  
Continuous Corn ◽  
Whole Plant ◽  
Silage Quality ◽  
Plant Yields ◽  
Soil Insecticides

Information on the risk of western corn rootworm, Diabrotica virgifera virgifera LeConte, damage to continuously-grown corn previously was lacking in Virginia, as well as other mid-Atlantic states. A field study was conducted in 1993 and 1994 comparing root damage, whole-plant yields, and silage quality in insecticide-treated and untreated sections of 32 continuous corn fields in Virginia. Approximately 28% of the fields had serious root damage exceeding a rating of 3.5 (1–6 scale) in sections not treated with a soil insecticide. Also, 19% of the fields had an economic loss in whole-plant yield due to corn rootworm feeding damage. Silage quality, as evidenced by percent crude protein and acid detergent fiber, was not significantly affected by corn rootworm feeding. Because much of the continuous corn acreage in Virginia is treated preventively with soil insecticides for corn rootworms, the results of this study suggest that a large percentage of this insecticide use is unnecessary.

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