THE DAMAGE POTENTIAL OF SOME GRASSHOPPERS (ORTHOPTERA: ACRIDIDAE) OF THE NATIVE GRASSLANDS OF BRITISH COLUMBIA

1962 ◽  
Vol 42 (4) ◽  
pp. 596-601 ◽  
Author(s):  
L. G. Putnam
Keyword(s):  
British Columbia ◽  
Chemical Control ◽  
Poa Pratensis ◽  
Control Treatment ◽  
Damage Potential ◽  
The Third ◽  
First Instar ◽  
Native Grasslands ◽  
Single Chemical ◽  
Stipa Comata

In caged plot experiments in the native grasslands of the Interior of the province of British Columbia, feeding during the whole nymphal life of the grasshopper Camnula pellucida reduced the yield of Poa pratensis by 5.1 pounds per acre for each grasshopper per square yard. For each unit of infestation of 1 young adult grasshopper per square yard, 1.0 pound per acre per day was destroyed. The corresponding figures for Amphitornus coloradus on Stipa comata were 3.5 and 0.57 pounds per acre. First-instar nymphs of the migratory grasshopper Melanoplus bilituratus failed to survive when confined to S. comata; nymphs in subsequent stages, that had previously fed on other foods, did not thrive on S. comata, and each unit of infestation of 1 per square yard finally reduced yields not more than 2.6 pounds per acre. The results suggest that, where a single chemical control treatment is desired, it should not be delayed past the third instar as the modal developmental stage.

CHEMICAL CONTROL OF THE EUROPEAN WIREWORM AGRIOTES OBSCURUS (L.) IN THE LOWER FRASER VALLEY OF BRITISH COLUMBIA

1957 ◽  
Vol 37 (4) ◽  
pp. 413-417 ◽  
Author(s):  
A. T. S. Wilkinson
Keyword(s):  
British Columbia ◽  
Chemical Control ◽  
Ethylene Dibromide ◽  
Agriotes Obscurus ◽  
The Third ◽  
Adequate Control ◽  
Good Protection ◽  
Cent Mortality ◽  
Silty Loam ◽  
Fraser Valley

The wireworm Agriotes obscurus (L.) was controlled in silty loam at Agassiz, British Columbia, from 1953 to 1956, by insecticides incorporated into the soil. Single applications of aldrin or heptachlor at 5 lb. of toxicant per acre gave good protection to potatoes planted a month after application, and gave 100 per cent mortality of wireworms by the second or third season. Aldrin at 2.5 lb., DDT at 15 lb., and granulated heptachlor at 3 lb. did not give adequate control in the year of application but gave appreciable control in the third and fourth seasons. Ethylene dibromide at 1.6 gal. per acre did not give control.

LIFE HISTORY OF CRICOTOPUS MYRIOPHYLLI OLIVER (DIPTERA: CHIRONOMIDAE) IN THE OKANAGAN VALLEY, BRITISH COLUMBIA

1993 ◽  
Vol 125 (6) ◽  
pp. 979-985 ◽  
Author(s):  
Ian V. MacRae ◽  
Richard A. Ring
Keyword(s):  
British Columbia ◽  
Life History ◽  
Sex Ratio ◽  
Larval Instar ◽  
Field Observations ◽  
Laboratory Rearing ◽  
The Third ◽  
First Instar ◽  
History Of ◽  
Rate Of Emergence

AbstractThe life history of Cricotopus myriophylli Oliver is described from both field observations and laboratory rearing of field-collected larvae. The species appears to be univoltine with four larval instars and has a sex ratio of ca. 2:1, males to females. Emergence begins in late May in British Columbia and continues until mid-September, with first-instar larvae present in the field from mid-June to mid-August. Water temperature does not appear to influence the rate of emergence. In the laboratory at 21 °C, larvae complete each of the third and fourth instars in 10–14 days. Cricotopus myriophylli overwinters primarily in the third larval instar, although second and fourth instars were also recovered in field-collected samples. First-instar larvae and eggs were not recovered from winter samples. This species does not appear to undergo a true diapause.

The Caragana Aphid, Acyrthosiphon caraganae (Cholod.) in Western Canada, and its Separation from the Pea Aphid

1962 ◽  
Vol 94 (10) ◽  
pp. 1075-1077 ◽  
Author(s):  
A. G. Robinson ◽  
G. A. Bradley
Keyword(s):  
British Columbia ◽  
North America ◽  
Chemical Control ◽  
Pea Aphid ◽  
Annual Reports ◽  
Western Canada ◽  
Forest Insect ◽  
Disease Survey ◽  
Caragana Arborescens

Except for occasional references in the Annual Reports of the Forest Insect and Disease Survey of infestations of an aphid on caragana (Caragana arborescens Lam.) in Western Canada and a note on chemical control (Bradley, 1952), there is no published record known to the authors of the occurrence of the caragana aphid, Acyrthosiphon caraganae (Cholod.), in North America. MacNay (1953) summarized reports that severe infesrations of aphids, “probably mainly the caragana aphid”, occurred on caragana in 1952 in the East Kootenays of British Columbia, and at several places in Alberta and Saskatchewan. At some localities 100 per cent defoliation was reported.

scholarly journals Cautious Optimism: Fraser v Canada (Attorney General)

2021 ◽  
Vol 30 (2) ◽  
pp. 1-14
Author(s):  
Jonnette Watson Hamilton
Keyword(s):  
British Columbia ◽  
Health Services ◽  
Adverse Effects ◽  
Negative Impact ◽  
Attorney General ◽  
The Other ◽  
Adverse Impact ◽  
Canadian Charter ◽  
The Third ◽  
Direct Discrimination

Adverse effects discrimination arises when a law that appears to be neutral on its face has a disproportionate and negative impact on members of a group identified by a protected ground.1 The discrimination is usually not as easy to see as it is in cases of direct discrimination, where distinctions are drawn by a law, program, or policy. This may be why Fraser v Canada (Attorney General)2 is only the third adverse effects claim under section 15(1) of the Canadian Charter of Rights and Freedoms3 to succeed since section 15 came into force in 1985.4 Fraser is notable simply because it is the first successful adverse effects claim in twenty-two years.5 1 Jonnette Watson Hamilton & Jennifer Koshan. “Adverse Impact: The Supreme Court’s Approach to Adverse Effects Discrimination under Section 15 of the Charter” (2015) 19:2 Rev Const Stud Studies 191 at 196 [“Adverse Impact”]. 2 2020 SCC 28 [Fraser]. 3 Part I of the Constitution Act, 1982, being Schedule B to the Canada Act 1982 (UK), 1982, c 11 [Charter]. 4 The other two cases in which adverse effects claims were successful were Eldridge v British Columbia, [1997] 3 SCR 624, 151 DLR (4th) 577 [Eldridge cited to SCR] and Vriend v Alberta, [1998] 1 SCR 493, 156 DLR (4th) 385 [Vriend cited to SCR]. 5 At least five adverse effects claims made under section 15 of the Charter failed in the intervening twentytwo years: Health Services and Support — Facilities Subsector Bargaining Assn v British Columbia, 2007 SCC

scholarly journals The Changing Regulatory Scheme in Northeast British Columbia

2011 ◽  
Vol 49 (2) ◽  
pp. 369 ◽  
Author(s):  
Wally Braul
Keyword(s):  
British Columbia ◽  
Land Tenure ◽  
Oil And Gas ◽  
Contaminated Sites ◽  
Public Concern ◽  
Consultation Process ◽  
New Era ◽  
The Third ◽  
Regulatory Changes ◽  
Exploration And Production

The Northeast British Columbia (NEBC) oil patch is undergoing a boom in land tenure sales, exploration, and production. This comes at a time of increasing public concern over the use of hydraulic fracturing (or “fracking”), an unconventional technology that ushered in a new era of production in NEBC, along with several new contentious issues. Recently, four significant regulatory changes have been enacted or planned for the immediate future. The first, likely in response to public concern over fracking, occurred in October 2010 with an overhaul of the decades-old Petroleum and Natural Gas Act and the coming into force of the bulk of the provisions in the Oil and Gas Activities Act. The changes primarily affect production and environmental management, and several new provisions have a direct impact on fracking. The second change under development is the creation of a long-awaited groundwater licencing regime, marking a stronger environmental presence in the NEBC, and possibly abrogating pre-existing extraction rights. The third change arises from the expiry of Crown-First Nation Consultation Process Agreements (CPAs). Recent jurisprudence continues to point to the need for improved consultation and accommodation, but current negotiations may or may not succeed in arriving at a more comprehensive successor to the expired CPAs. Finally, under British Columbia’s contaminated sites regime, new measures expand the liability exposure of oil patch operators for contaminated sites in both civil actions and government enforcement proceedings.

scholarly journals AKTIVITAS EKSTRAK BIJI TANAMAN MINDI MELIA AZEDARACH (L.) TERHADAP SPODOPTERA LITURA (F.) (LEPIDOPTERA: NOCTUIDAE)

2005 ◽  
Vol 5 (1) ◽  
pp. 11-16
Author(s):  
Hamdani Hamdani
Keyword(s):  
Biological Activity ◽  
Insecticidal Activity ◽  
Spodoptera Litura ◽  
Developmental Time ◽  
Seed Extract ◽  
Melia Azedarach ◽  
The Third ◽  
First Instar ◽  
Lepidoptera Noctuidae

Activity of Melia azedarach (L.) seed extract against armyworm Spodoptera litura (F.) (Lepidoptera: Noctuidae). This study was conducted to evaluate the effectivenes and biological activity of Melia azedarach L. (Meliaceae) seed extract against armyworm, Spodoptera litura F. The first instar larvae were fed extract-treated cotton leaves for 2 days, then were maintained on untreated leaves until the third instar stage. Records were kept in regard to the larvae mortality and developmental time of surviving larvae from first instar to third instar. The result showed that Melia azedarach L. seed extract at consentration of 50 g of seeds/l of water (5%) exhibited moderate insecticidal activity against S. litura larvae (43.33 - 68.33% mortality). Addition of detergen at 0.2% to extract did not increase insecticidal activity of the extract. However, boiling seed extract at consentration of 50 g of seeds/l of water (5%) during 10 until 20 minutes increased insecticidal activity of extract (66.67 - 68.33% mortality). Generally, M. azedarach seed extract treatment did not affect  developmental time of  S. litura larvae.

scholarly journals Efficacy of Bacillus thuringiensis (Berliner) isolates on fig moth, Ephestia cautella (Walker) Larvae

2014 ◽  
Vol 11 (2) ◽  
pp. 943-951
Author(s):  
Baghdad Science Journal
Keyword(s):  
Bacillus Thuringiensis ◽  
Larval Stage ◽  
Filter Paper ◽  
Larval Instar ◽  
Ephestia Cautella ◽  
Larval Stages ◽  
The Third ◽  
Total Percentage ◽  
First Instar ◽  
Paper Method

The following dilution 5×10-1, 10-1, 10?2 , 10-3 gm/L for the indigenous isolate of Bacillus thuringiensis bacteria and the commercially isalate were used for experiments against the different stages of fig moth of E.cautella which exposed by filter paper method. The results showed that mortality of larval stages was increased with the increasing concentration of the biocide, in addition to increase in the mortality of the larval stages reached to the highest percentage in the third days of treatment of the larval stage in comparison with the first and second days of exposure. The results also showed that the sensitivity of larval stages was increased in first and second instars while reduced in the last instars .The high percentage of first instar mortality for the indigenous isolate in the concentration of 5×10-1 was 72.8% , while the low percentage of mortality showed in the concentration of 5×10-1 for the fifth instar larvae which was 13.3% in third days of treatment while a high percentage of mortality was showed for the first instar larvae for the commercially isulate in the concentration of 5×10-1 was 59.4% Furthermore, low percentage of mortality was shown in the concentration of 5×10-1 in fifth instar larval which was 8.3% in the third days of treatment. The results also showed that the indigenous isolated was more effective than the commercially produced bacteria for killing larval instars of fig moth E.cautella .The total percentage of larval instar mortality reached to 44.5 % after the third days of treatment in concentration 5×10-1 in the indigenous isolate , and it was 33.8 % in the commercially produced bacteria .

scholarly journals Biologi Stenocranus pacificus Kirkaldy (Hemiptera: Delphacidae) pada tanaman jagung (Zea mays L.) di rumah kasa

2020 ◽  
Vol 17 (2) ◽  
pp. 104
Author(s):  
Dosma Ulina Simbolon ◽  
Maryani Cyccu Tobing ◽  
Darma Bakti
Keyword(s):  
Zea Mays ◽  
Life Cycle ◽  
Sex Ratio ◽  
Zea Mays L ◽  
Instar Nymph ◽  
Fourth Instar ◽  
The Third ◽  
First Instar ◽  
Corn Plants ◽  
North Sumatra

<p><em>Stenocranus pacificus </em>Kirkaldy (Hemiptera: Delphacidae) is destructive pest on corn plants in South Lampung and it has been reported to cause corn damages in North Sumatra. The  objective of this research was to study some aspects biology of <em>S. pacificus</em> on corn plants in screenhouse. The research was conducted by observing the biology of <em>S. pacificus</em> that was reared on corn plants in screenhouse.<em> </em>The results showed that life cycle of <em>S. pacificus </em>was 38–47 (41,60 ± 3,19) days: egg was 9–11 (10,20 ± 0,79) days, the first instar nymph was 3–4 (3,70 ± 0,48) days, the second instar nymph was 3–4 (3,90 ± 0,32) days, the third instar nymph was 3–4 (3,70 ± 0,48) days, the fourth instar nymph was 3–4 (3,80 ± 0,42) days, and the fifth instar nymph was 3–4 (3,60 ± 0,52) days. Age of female was 13–17 (15,30 ± 1,34) days. It was longer than age of male which was 8–12 (10,10 ± 1,20) days. Female could produce 181–214 (197,60 ± 11,64) eggs during its life. The sex ratio was 1:1,98.</p>

Effects of foliar applied nitrogen fertilizer on cotton waterlogged in a cracking grey clay

1987 ◽  
Vol 38 (4) ◽  
pp. 681 ◽  
Author(s):  
AS Hodgson ◽  
DA MacLeod
Keyword(s):  
Nitrogen Fertilizer ◽  
Furrow Irrigation ◽  
N Fertilizer ◽  
Control Treatment ◽  
Yield Response ◽  
The Third ◽  
Foliar N ◽  
Waterlogging Treatment ◽  
Applied Nitrogen

Foliar-applied nitrogen (N) fertilizer was investigated as a means of ameliorating the damage to cotton of waterlogging associated with extended furrow irrigation of a cracking grey clay. Dissolved urea was applied at 0, 5, 10 and 20 kg N ha-1 to the cotton foliage one day before furrow irrigations lasting 4, 8, 16 and 32 h. Treatments were repeated at three crop irrigations. Storms following the first two irrigations delayed the recovery from waterlogging and reduced treatment differences. However, foliar-applied N significantly increased late square and green boll numbers after the third irrigation, and produced more open bolls and heavier lint yields than the control treatment at harvest. Lint yields increased by 2.8, 5.9, 8.4 and up to 10.5 kg ha-1 per kg of foliar N applied before irrigations lasting 4, 8, 16 and 32 h, respectively. From this interaction it was concluded that foliar-applied N ameliorated the effects of waterlogging. Nevertheless, in the most severe waterlogging treatment, yield response to foliar N reached a limit, indicating that some other factor had become limiting.

Lophodermium oxycocci. [Descriptions of Fungi and Bacteria].

2005 ◽  
Author(s):  
D. W. Minter
Keyword(s):  
British Columbia ◽  
Czech Republic ◽  
New Jersey ◽  
Geographical Distribution ◽  
Chemical Control ◽  
Vaccinium Macrocarpon ◽  
Economic Damage ◽  
Twig Blight

Abstract A description is provided for Lophodermium oxycocci. Information is included on the disease, cranberry twig blight, caused by the organism, that can cause serious economic damage to commercial cranberry crops in Oregon and Washington. Some information on cultural and chemical control is given, along with details of its transmission, geographical distribution (Canada (British Columbia), USA (Alaska, Maine, Massachusetts, Michigan, New Jersey, Oregon and Washington), Russia, Czech Republic, Finland, France, Germany, UK, Poland, Sweden and Ukraine) and hosts (Vaccinium macrocarpon, Vaccinium sp. and V. oxycoccus).

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