scholarly journals Colorado Potato Beetle Control with Simulated Transplant Water Treatments of Admire to Eggplants, 1995

1997 ◽  
Vol 22 (1) ◽  
pp. 131-132
Author(s):  
Galen P. Dively ◽  
James J. Linduska ◽  
Marylee Ross ◽  
Karen Mulford ◽  
Donna Baumann
Keyword(s):  
Water Treatment ◽  
Experimental Design ◽  
Colorado Potato Beetle ◽  
Plot Size ◽  
Potato Beetle ◽  
Marketable Fruit ◽  
Water Treatments ◽  
Early Larvae

Abstract The experimental design was a RCB design with eight replications and 4 treatments. Drenching doses were 0, 0.38, 1.5, and 6.0 ounces ; of Admire 2F per acre. At transplanting, before the root ball was covered with soil, the drench was applied as a simulated transplant water treatment of 8 oz diluted volume per plant. Plot size for each treatment was one row 20 feet long (8 eggplants) with rows spaced 72 inches apart. Plots were planted 3 ; Jul. After transplanting, weekly counts were made of egg clusters, early larvae (first/second instars), late larvae (third/fourth instars), live and dead adults, i percent defoliation and percent stand loss. Plots were not harvested to remove fruit; instead the number of marketable fruit was counted once on 9 Sep.

scholarly journals Colorado Potato Beetle Control with Transplant Drench Treatments of Admire to Bedding Trays of Tomatoes, 1996

1997 ◽  
Vol 22 (1) ◽  
pp. 177-177 ◽  
Author(s):  
Galen P. Dively ◽  
James J. Linduska ◽  
Marylee Ross ◽  
Donna Baumann ◽  
Carol Cain ◽  
...  
Keyword(s):  
Experimental Design ◽  
Colorado Potato Beetle ◽  
Treatment Combination ◽  
Tomato Plants ◽  
Plot Size ◽  
Potato Beetle ◽  
Early Larvae

Abstract The experimental design was a RCB design with four replications and 8 treatments. Drenching doses were 0 (two controls per block), 0.25, 0.5, 1.0, 2.0, 4.0 and 8.0 ounces of Admire 2F per acre equivalence of bedding trays. The diluted drench was applied to individual cells of bedding trays using a pipetted volume of one ml per plant. In addition, a drench treatment of 16 fluid oz of Admire was applied in the transplant water. Plot size for each treatment combination was one row 20 feet long (20 tomato plants) with rows spaced 64 inches apart. Plots were planted 14 May. After transplanting, weekly counts were made of egg clusters, early larvae (first/second instars), late larvae (third/fourth instars), live adults, and dead adults on the ground. Percent defoliation was recorded per plant at two times. Plots were harvested and graded on 8 Aug.

scholarly journals Colorado Potato Beetle Control with Transplant Drench Treatments of Admire to Bedding Trays of Tomato and Eggplant, 1995

1997 ◽  
Vol 22 (1) ◽  
pp. 176-176
Author(s):  
Galen P. Dively ◽  
James J. Linduska ◽  
Marylee Ross ◽  
Karen Mulford ◽  
Donna Baumann
Keyword(s):  
Experimental Design ◽  
Colorado Potato Beetle ◽  
Treatment Combination ◽  
Tomato Plants ◽  
Plot Size ◽  
Potato Beetle ◽  
Split Plot

Abstract The experimental design was a split-split plot with eight randomized blocks in which two host crops (tomato and eggplant) were designated as whole plots, seven imidacloprid doses as sub-plots, and two times of application (one day and 7 days before transplanting) as sub-sub plots. Drenching doses were 0, 0.25, 0.5, 1.0, 2.0, 4.0 and 8.0 ounces of Admire 2F per acre equivalence of bedding trays of tomatoes and 0, 0.18, 0.38, 0.75, 1.5, 3.0 and 6.0 ounces of Admire 2F per acre equivalence of bedding trays of eggplant. The diluted drench was applied to individual cells of bedding trays using a pipetted volume of one ml per plant. Plot size for each treatment combination was one row 20 feet long (20 tomato plants, 8 eggplants) with rows spaced 72 inches apart. Plots were planted 9 Jun using 288 cell trays. After transplanting, weekly counts were made of live and dead adults, percent defoliation, and percent stand loss.

A treatability index for reservoir water

1998 ◽  
Vol 37 (2) ◽  
pp. 27-33 ◽  
Author(s):  
C. T. Ta ◽  
C. A. Woodward
Keyword(s):  
Water Treatment ◽  
Filtration Rate ◽  
Water Area ◽  
Reservoir Water ◽  
Algal Concentration ◽  
Run Lengths ◽  
Water Treatments

A Treatability Index is developed to allow comparison of different reservoir waters according to their effects on a water treatments works. For the water treatment works which employs rapid gravity filters, the index is the product of the algal concentration, the clarification coefficients of algae and the filtration rate. The index is applied to reservoir waters within Thames Water area. Algae observed in reservoirs are grouped according to their shapes. Among these groups, twenty frequently observed species were selected and their clarification coefficients were measured. The treatability index was then evaluated for different waters and at different times of the year. The results were correlated to the filter run lengths and the development of headloss across the filters.

scholarly journals AFLP-Based Genetic Linkage Map of the Colorado Potato Beetle Leptinotarsa decemlineata: Sex Chromosomes and a Pyrethroid-Resistance Candidate Gene

Genetics ◽  
2001 ◽  
Vol 158 (2) ◽  
pp. 695-700 ◽  
Author(s):  
David J Hawthorne
Keyword(s):  
Candidate Gene ◽  
Linkage Map ◽  
Colorado Potato Beetle ◽  
Leptinotarsa Decemlineata ◽  
Genetic Linkage ◽  
Genetic Linkage Map ◽  
Sex Chromosome ◽  
Pyrethroid Resistance ◽  
Codominant Markers ◽  
Potato Beetle

Abstract A genetic linkage map was constructed from an intraspecific cross of the Colorado potato beetle, Leptinotarsa decemlineata. This is an initial step toward mapping the loci that underlie important phenotypes associated with insect adaptation to an agroecosystem. The map was made with 172 AFLP and 10 anonymous codominant markers segregating among 74 backcross (BC1) individuals. Markers were mapped to 18 linkage groups and a subset of the markers with a mean intermarker distance of 11.1 cM is presented. A pyrethroid-resistance candidate gene, LdVssc1, was placed onto the map as well. The sex chromosome was identified by exploiting the XO nature of sex determination in this species using patterns of variation at LdVssc1 and the codominant markers.

scholarly journals Field Efficacy of Steinernema sp. (Rhabditida: Steinernematidae) on the Colorado Potato Beetle Overwintering Generation

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1464
Author(s):  
Maja Čačija ◽  
Renata Bažok ◽  
Majda Kolenc ◽  
Tena Bujas ◽  
Zrinka Drmić ◽  
...  
Keyword(s):  
Colorado Potato Beetle ◽  
First Generation ◽  
Control Measures ◽  
Recommended Dose ◽  
Steinernema Feltiae ◽  
First Year ◽  
Potato Beetle ◽  
Field Efficacy ◽  
Second Year ◽  
Economic Pest

Colorado potato beetle (CPB) is an economic pest of potato that has developed resistance to all classes of chemical insecticides, thus requiring alternative control measures. As a potential solution, entomopathogenic nematodes (EPNs) have proven effective in suppressing this pest, but their efficacy against overwintering generations of CPB in Croatia has not been sufficiently researched. The aim of this two-year (2018–2019) field study was to determine the efficacy of Steinernema feltiae and Steinernema carpocapsae applied to overwintering CPB adults. EPNs were applied at three doses (7.5 mil./10 m2, 5.0 mil./10 m2 (the recommended dose) and 2.5 mil./10 m2) by watering the soil where the adults were overwintering. The first-year results were satisfactory for both EPNs: the efficacy of S. feltiae ranged from 79.03% to 100.00%, while the efficacy of S. carpocapsae ranged from 77.32% to 96.22%. In the second year, the highest efficacy (69.57%) was obtained using the recommended dose of S. feltiae. Although the results are not consistent across the two years of our study and suggest further research, they indicate that EPNs have great potential in controlling overwintering CPB generations to reduce first generation abundance and damage, and also to prevent the spread of new generations to surrounding potato growing areas.

scholarly journals Genetic loci regulating cadmium content in rice grains

Euphytica ◽  
2021 ◽  
Vol 217 (3) ◽  
Author(s):  
Gareth J. Norton ◽  
Anthony Travis ◽  
Panthita Ruang-areerate ◽  
Graeme W. Nicol ◽  
Ayotunde A. Adeosun ◽  
...  
Keyword(s):  
Water Treatment ◽  
Water Regime ◽  
Field Experiments ◽  
Cadmium Concentration ◽  
Chromosome 9 ◽  
Chromosome 7 ◽  
Cadmium Content ◽  
Rice Grains ◽  
Water Treatments ◽  
Grain Cadmium

AbstractIt has been estimated that up to 90% of human exposure to cadmium is through food, and that cadmium within rice grains can be a major contributor to that dietary source. In this study genome wide association mapping was conducted on the Bengal and Assam Aus Panel (BAAP) of rice to identify quantitative trait loci and candidate genes for lowering grain cadmium. Field experiments were conducted over two years under two different irrigation systems: continually flooded and alternate wetting and drying (AWD). There was significant effects of water treatment, genotype, and genotype by water treatment interaction. Importantly, AWD increased grain cadmium, on average, by 49.6% and 108.8% in year 1 and 2 respectively. There was between 4.6 and 28 fold variation in cadmium concentration. A total of 58 QTLs were detected but no loci are clearly specific to one water regime despite approximately 20% of variation attributable to genotype by water regime interaction. A number of QTLs were consistent across most water treatments and years. These included QTLs on chromosome 7 (7.23–7.61, 8.93–9.04, and 29.12–29.14 Mbp), chromosome 5 (8.66–8.72 Mbp), and chromosome 9 (11.46–11.64 Mbp). Further analysis of the loci on chromosome 7 (8.93–9.04 Mbp), identified the candidate gene OsNRAMP1, where cultivars with a deletion upstream of the gene had higher concentrations of cadmium compared to the cultivars that did not have the deletion. The distribution of alleles within the BAAP suggest this QTL is easily detected in this population because it is composed of aus cultivars. Local genome cluster analysis suggest high Cd alleles are uncommon, but should be avoided in breeding.

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