Consumptive and non‐consumptive effects of wolf spiders on cucumber beetles and cucumber plant damage

Varying concentrations (500-4000 mg·L–1) of ethephon, an ethylene-releasing compound, were applied to 3-year-old ginseng (Panax quinquefolium L.) plants in fields of southern Ontario. The effects of this chemical on fruit removal, plant damage, infructescence morphology, and root mass were studied and compared to the normal practice of manual inflorescence removal. The highest concentrations had the highest rates of removal but also caused the greatest amount of damage to the whole plants when compared to the mid-range concentrations. The lowest concentrations showed less foliar damage but did not provide sufficient fruit removal to mimic hand removal. When individual inflorescences of the ethephon treatments were studied, the seed heads had fewer ripe berries and more unpollinated florets than the untreated controls. When root masses were compared, high and low concentrations showed lower masses than those of the standard production practice of hand removal. However, mid range concentrations showed similar root mass increase to manual removal. When all parameters were considered, the concentration range giving the best results was 1000-1500 mg·L–1. Multiple applications of ethephon, at weekly intervals, had an additive effect on flower removal and plant damage. Treatments having an additive concentration of over 2000 mg·L–1 had detrimental effects on all parameters. Those within the 1000–1500 mg·L–1 range showed the highest similarity to the hand removal benefits.

Download Full-text

Indices of Plant Damage and Heritability of Tolerance to the Spotted Alfalfa Aphid in Alfalfa

Crop Science ◽

10.2135/cropsci1989.0011183x002900060001x ◽

1989 ◽

Vol 29 (6) ◽

pp. 1337-1340 ◽

Cited By ~ 5

Author(s):

H. O. Jimenez ◽

J. L. Caddel ◽

R. C. Berberet ◽

R. W. McNew

Keyword(s):

Plant Damage

Download Full-text

Tracing of Ag- and CeO2 based engineered nanoparticles in cucumber plant system

Journal of Environmental Chemical Engineering ◽

10.1016/j.jece.2021.105778 ◽

2021 ◽

pp. 105778

Author(s):

Bhaskar Bhaduri ◽

Jayashree Nath

Keyword(s):

Engineered Nanoparticles ◽

Cucumber Plant ◽

Plant System

Download Full-text

The brain transcriptome of the wolf spider, Schizocosa ocreata

BMC Research Notes ◽

10.1186/s13104-021-05648-y ◽

2021 ◽

Vol 14 (1) ◽

Author(s):

Daniel Stribling ◽

Peter L. Chang ◽

Justin E. Dalton ◽

Christopher A. Conow ◽

Malcolm Rosenthal ◽

...

Keyword(s):

Gene Expression ◽

De Novo ◽

Transcriptome Assembly ◽

Model Organisms ◽

De Novo Transcriptome Assembly ◽

De Novo Transcriptome ◽

Wolf Spiders ◽

Schizocosa Ocreata ◽

Genomic Studies ◽

The Brain

Abstract Objectives Arachnids have fascinating and unique biology, particularly for questions on sex differences and behavior, creating the potential for development of powerful emerging models in this group. Recent advances in genomic techniques have paved the way for a significant increase in the breadth of genomic studies in non-model organisms. One growing area of research is comparative transcriptomics. When phylogenetic relationships to model organisms are known, comparative genomic studies provide context for analysis of homologous genes and pathways. The goal of this study was to lay the groundwork for comparative transcriptomics of sex differences in the brain of wolf spiders, a non-model organism of the pyhlum Euarthropoda, by generating transcriptomes and analyzing gene expression. Data description To examine sex-differential gene expression, short read transcript sequencing and de novo transcriptome assembly were performed. Messenger RNA was isolated from brain tissue of male and female subadult and mature wolf spiders (Schizocosa ocreata). The raw data consist of sequences for the two different life stages in each sex. Computational analyses on these data include de novo transcriptome assembly and differential expression analyses. Sample-specific and combined transcriptomes, gene annotations, and differential expression results are described in this data note and are available from publicly-available databases.

Download Full-text

Flea Beetle Control in Lower Rainfall Se Washington, 1995

Arthropod Management Tests ◽

10.1093/amt/21.1.205 ◽

1996 ◽

Vol 21 (1) ◽

pp. 205-205

Author(s):

D. E. Bragg ◽

D. Mayer

Keyword(s):

Flea Beetle ◽

Plant Introduction ◽

Plant Damage ◽

Total Destruction ◽

Cotyledon Stage ◽

Untreated Check ◽

Plant Stand

Abstract Plots were planted 9 June at the USDA-ARS Western Plant Introduction Center at Central Ferry, WA at a rate of 6 lb/acre in rows 7 inches apart. Plots were 15 x 3 ft replicated in a RCBD 4 times, and were situated with replicates perpendicular to a crested wheat grass field. Precounts (PrCt) of plant stand per 6.6 ft row, and damage on 20 randomly selected plants on a scale of 0 to 6, with 0 = no damage and 6 = total destruction, were made 21 Jun. A treatment consisting of Furadan CR-10 granules at a rate of 2.5 lb product per acre was applied at seeding. Four other insecticide treatments were made with a CO2 backpack sprayer at 20 gpa and 20 psi on 22 Jun. An untreated check was established. Conditions at treatment were 70°F with a 2 mph wind at 11 a.m. All plants were in the cotyledon stage with meristem visible. Evaluations of stand reduction and plant damage were made on 2, 5, 7, and 10 DAT. All surviving plants were in the rosette stage (5 to 7 leaf) at 10 DAT.

Download Full-text