scholarly journals How Kansas Crop Consultants Scout for Western Corn Rootworms (Coleoptera: Chrysomelidae) in Field Corn

2007 ◽  
Vol 53 (1) ◽  
pp. 8-11
Author(s):  
C. A. Daves ◽  
R. A. Higgins ◽  
P. E. Sloderbeck ◽  
G. E. Wilde ◽  
R. J. Whitworth ◽  
...  
Keyword(s):  
Field Corn ◽  
Corn Rootworms

EFFICIENT MONITORING OF THE DENSITY OF ADULT NORTHERN CORN ROOTWORM (COLEOPTERA: CHRYSOMELIDAE) IN HELD CORN

1985 ◽  
Vol 117 (2) ◽  
pp. 171-183 ◽  
Author(s):  
Alan J. Sawyer
Keyword(s):  
New York ◽  
Sequential Sampling ◽  
Plant Sample ◽  
Sample Sizes ◽  
Sequential Sampling Plan ◽  
Field Corn ◽  
Corn Rootworms ◽  
Entire Plant ◽  
Sampling Statistics ◽  
Northern Corn Rootworm

AbstractSampling statistics for adult northern corn rootworms in New York field corn are reported, with particular reference to efficient monitoring for decision-making in pest management. The most efficient sample unit of those examined was a single, entire plant. Sample sizes and associated costs required to achieve fixed levels of precision for estimates of density are reported. Because required sample sizes are density dependent, a sequential-sampling plan providing final estimates of density at preset levels of precision is developed. The method makes no assumption about the frequency distribution of insect counts, which was found to vary from field to field and with time. Disturbance caused by sampling activity may introduce a bias of unknown direction and magnitude in estimates of beetle density. Care in approaching and examining plants; should reduce this bias.

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.

scholarly journals Birds suppress pests in corn but release them in soybean crops within a mixed prairie/agriculture system

The Condor ◽  
2020 ◽  
Vol 122 (2) ◽  
Author(s):  
Megan B Garfinkel ◽  
Emily S Minor ◽  
Christopher J Whelan
Keyword(s):  
Large Scale ◽  
Corn Yield ◽  
Beneficial Arthropods ◽  
Fecal Samples ◽  
Crop Fields ◽  
Field Corn ◽  
Corn Rootworms ◽  
Yield Gain ◽  
Crop Agriculture ◽  
Mixed Prairie

Abstract Birds provide ecosystem services (pest control) in many agroecosystems and have neutral or negative ecological effects (disservices) in others. Large-scale, conventional row crop agriculture is extremely widespread globally, yet few studies of bird effects take place in these agroecosystems. We studied indirect effects of insectivorous birds on corn and soybean crops in fields adjacent to a prairie in Illinois (USA). We hypothesized that prairie birds would forage for arthropods in adjacent crop fields and that the magnitude of services or disservices would decrease with distance from the prairie. We used bird-excluding cages over crops to examine the net effect of birds on corn and soybean grain yield. We also conducted DNA metabarcoding to identify arthropod prey in fecal samples from captured birds. Our exclosure experiments revealed that birds provided net services in corn and net disservices in soybeans. Distance from prairie was not a significant predictor of exclosure treatment effect in either crop. Many bird fecal samples contained DNA from both beneficial arthropods and known economically significant pests of corn, but few economically significant pests of soybeans. Song Sparrows (Melospiza melodia), one of our most captured species, most commonly consumed corn rootworms, an economically significant pest of corn crops. We estimated that birds in this system provided a service worth approximately US $275 ha−1 in corn yield gain, and a disservice valued at approximately $348 ha−1 in soybean yield loss. Our study is the first to demonstrate that birds can provide substantial and economically valuable services in field corn, and disservices in soybean crops. The contrasting findings in the 2 crop systems suggest a range of bird impacts within widespread agroecosystems and demonstrate the importance of quantifying net trophic effects.

Rotation-Resistant Corn Rootworms 2006

2006 ◽  
Author(s):  
Jon Tollefson ◽  
Patricia Prasifka ◽  
Benjamin Kaeb
Keyword(s):  
Corn Rootworms

Performance of Mixtures of Field Corn ( Zea mays L.) Hybrids 1

Crop Science ◽  
1964 ◽  
Vol 4 (4) ◽  
pp. 353-356 ◽  
Author(s):  
C. R. Funk ◽  
J. C. Anderson
Keyword(s):  
Zea Mays ◽  
Zea Mays L ◽  
Field Corn

scholarly journals Performance of Selected Grain Protectants Against Maize/Rice Weevil in Stored Field Corn, 2020

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
Don Cook ◽  
Meg Threet ◽  
Jeff Gore ◽  
Whitney Crow ◽  
Angus Catchot
Keyword(s):  
Rice Weevil ◽  
Field Corn ◽  
Grain Protectants

scholarly journals Pest Status and Management of Corn Earworm (Lepidoptera: Noctuidae) in Field Corn in the United States

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Francis P F Reay-Jones
Keyword(s):  
United States ◽  
Selection Pressure ◽  
The United States ◽  
Corn Earworm ◽  
Bt Corn ◽  
Pest Status ◽  
Field Corn ◽  
Type Of Injury ◽  
The Impact ◽  
Economic Pest

Abstract The corn earworm, Helicoverpa zea (Boddie), is a common lepidopteran pest of corn (Zea mays L.) in the United States. This article provides an overview of the life history, ecology, plant injury, and management of H. zea in corn. Leaf injury by H. zea feeding can occur in vegetative stage corn, though this type of injury is rare. The most common type of injury is caused by larval feeding in ears. Because kernel injury is typically limited to the tip of the ear, H. zea is generally not considered an economic pest. The use of transgenic corn hybrids expressing insecticidal Cry proteins from Bacillus thuringiensis (Bt) Berliner can reduce injury from H. zea, though complete control is not achieved with most Bt traits. Resistance has been reported to several Bt toxins. Because H. zea is a major economic pest in cotton (Gossypium hirsutum L.) and because H. zea moths that developed on corn can migrate to cotton, selection pressure on H. zea in Bt corn has major implications for the pest status and injury to Bt cotton. Although the impact of H. zea on yield of field corn is generally negligible, the selection pressure exerted by Bt corn has led to management issues in cotton.

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