Potato Field Colonization by Low-Density Populations of Colorado Potato Beetle as a Function of Crop Rotation Distance

The effect of crop rotation was investigated on the efficacy and the economics of various insecticide strategies for Colorado potato beetle (CPB) control in potatoes (Solanum tuberosum L.) in 1995-96. These included broad-spectrum insecticides and biorational (environmentally friendly, naturally occurring) combinations that targeted specific CPB life stages. CPB pressure was greater in the nonrotated than the rotated plots. Although all materials gave better CPB control than the check, significantly more spray applications were required to reduce CPB numbers below treatment thresholds in the nonrotated plots than the rotated plots in both years. Overall yields and economic returns were significantly greater in the rotated plots in 1995. Efficacy of insecticide strategies varied, with little defoliation and few CPB larvae found in the imidacloprid treatment in 1995 and 1996. All insecticide strategies except endosulfan resulted in significantly higher estimated returns to management than the untreated check; the greatest returns occurred with permethrin and cryolite. No yields or returns could be obtained in 1996 due to excessive rainfall before harvest. These results indicate that yield and the cost of the insecticide strategy should be considered as well as insecticide efficacy in developing an effective integrated pest management program.

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Control of Resistant Colorado Potato Beetle in Early Market Potato, Big Lake, Mn, 1993

Arthropod Management Tests ◽

10.1093/amt/19.1.115 ◽

1994 ◽

Vol 19 (1) ◽

pp. 115-115

Author(s):

David Noetzle ◽

Jennifer Miller

Keyword(s):

Colorado Potato Beetle ◽

Block Design ◽

Potato Field ◽

Synthetic Materials ◽

Potato Beetle ◽

Commercial Potato ◽

Row Width ◽

Randomized Complete Block Design ◽

The Individual ◽

Early Market

Abstract Continued failure of most insecticides for control of CPB in the Anoka Sand Plains growing area stimulated further comparisons of biologicals, inorganics, and synthetic materials for CPB management. Soils are sands at this location. Plots were established in an irrigated commercial potato field. The individual plot consisted of 4—25 ft rows with a row width of 3 ft. Treatments were arranged in a randomized complete block design and were replicated 4 times. The grower treated all of the field, including the plots, with Thiodan and Asana XL at 1.0 lb and 0.5 lb Al/acre respectively on 8 Jul and 16 Jul. Plot treatments were applied on 25 Jun, 6 and 19 Jul using a CO2 hand sprayer with about 20 gals total material/acre and 40 psi pressure. Larval ratings and defoliation estimates were taken on 6 and 19 Jul. Vines were killed on 3 Aug and yields collected on 18 Aug. The center 2 rows of each plot were harvested for yield.

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Control of Resistant Colorado Potato Beetle, Big Lake, Mn, 1995

Arthropod Management Tests ◽

10.1093/amt/21.1.146 ◽

1996 ◽

Vol 21 (1) ◽

pp. 146-146

Author(s):

David M. Noetzel ◽

Jennifer Miller

Keyword(s):

Colorado Potato Beetle ◽

Potato Field ◽

Total Material ◽

Potato Beetle ◽

Commercial Potato ◽

Field Plots ◽

Very High

Abstract A trial was established in an irrigated commercial potato field adjacent to a commercial planting of a NatureMark NewLeafⓇ field. Plots were 4-36 inch rows by 25’ in length. Treatments were arranged in a RCB and replicated 4 times. Treatments were applied on 8 & 26 June and 8 July using a CO2 hand held sprayer. Total material per acre was approximately 20 gal applied using 40 psi. CPB populations were very high at this site and late readings are confused by non-random feeding. Yields were not taken.

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Control of Colorado Potato Beetle, 1997A

Arthropod Management Tests ◽

10.1093/amt/23.1.127a ◽

1998 ◽

Vol 23 (1) ◽

pp. 127-127

Author(s):

Craig A. Longtine ◽

David W. Ragsdale ◽

Edward B. Radcliffe

Keyword(s):

Colorado Potato Beetle ◽

Potato Field ◽

Plant Spacing ◽

Single Treatment ◽

Randomized Design ◽

Potato Beetle ◽

Commercial Potato ◽

Completely Randomized Design ◽

Direct Counts ◽

Flat Fan Nozzle

Abstract This trial was located in a non-irrigated commercial potato field near Hollandale in southern Minnesota. Plots consisted of a single treatment row 25 ft in length bordered on each side by two untreated guard rows. Plant spacing was 36 inches between rows and 12 inches between plants within rows. Treatments were replicated four times in a completely randomized design. Treatments were applied with a CO2-pressurized backpack sprayer fitted with a single Teejet 8003-E flat-fan nozzle delivering 40 gpa/acre at 35 psi. All treatments were applied on 2 Jul. Spraying conditions were windy, but winds were constant. In evaluating the treatments, direct counts of early instars (first and second) and late instars (third and fourth) were made on every plant in each plot on 3 Jul. The data were subjected to analyses of variance following log10(x +1) transformation.

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