Distribution of Carduus nutans, C. acanthoides, C. pycnocephalus, and C. crispus, in the United States

Weed Science ◽  
1976 ◽  
Vol 24 (5) ◽  
pp. 518-524 ◽  
Author(s):  
P. H. Dunn
Keyword(s):  
United States ◽  
The United States ◽  
Economic Importance ◽  
Limited Distribution ◽  
Carduus Acanthoides ◽  
Carduus Nutans ◽  
Pest Status

A survey determined the extent and severity of the infestations of four species of Carduus thistles in the United States. In the mainland United States, 360 counties of 3068 have economically important infestations of musk thistle (Carduus nutans L.), the Appalachian and midwest regions harboring the greatest infestations. Plumeless thistle (Carduus acanthoides L.) and Italian thistle (Carduus pycnocephalus L.) are of economic importance, but have limited distribution. Welted thistle (Carduus crispus L.) is approaching pest status only in Virginia.

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.

Clover Broomrape (Orobanche minor) in the United States

Weed Science ◽  
1980 ◽  
Vol 28 (1) ◽  
pp. 119-122 ◽  
Author(s):  
Cecil C. Frost ◽  
Lytton J. Musselman
Keyword(s):  
United States ◽  
White Clover ◽  
District Of Columbia ◽  
The United States ◽  
Economic Importance ◽  
Burley Tobacco ◽  
Ornamental Shrubs ◽  
Orobanche Minor

Based on an herbarium survey, clover broomrape (Orobanche minor J. E. Smith) was found to have an 116 yr history in the United States. It has been collected 98 times in a total of 32 counties in 12 states and the District of Columbia, and it appears to have become established in seaports and along railroads. It most commonly parasitizes red and white clover, but also burley tobacco, carrots, and several species of ornamental shrubs and herbs. Distribution of clover broomrape indicates either a pattern of repeated introductions from foreign sources, or a persistence in areas where the parasite has become established. While not presently a significant threat, the potential for damage to crops of economic importance cannot be ruled out. The flowers are autogamous.

NOTES ON A EUROPEAN WEEVIL, CEUTORHYNCHUS ASSIMILIS PAYK., RECENTLY FOUND IN THE STATE OF WASHINGTON

1936 ◽  
Vol 68 (9) ◽  
pp. 191-193 ◽  
Author(s):  
WM. W. Baker
Keyword(s):  
United States ◽  
North America ◽  
The United States ◽  
Economic Importance ◽  
The State ◽  
Ceutorhynchus Assimilis ◽  
Cabbage Seed ◽  
Seed Growing

During May, 1935, C. F. Doucette collected a few adult weevils on flower heads of mustard growing at the edge of a bulb field near Lynden. Wash. These weevils were recognized by the writer as apparently different from any of the species listed from North America, and a trip was made to Lynden on June 1, 1935, to obtain additional specimens. Specimens were also collected on mustard close to the northern limits of Bellingham, at two points between there and Lynden, north of Lynden, and in the vicinity of Nooksack, all in Watcom County. On the following day two specimens were collected on mustard at Big Lake, Skagit County. Big Lake is practically in the seed-growing section of the county, where a large portion of the cabbage seed used in the United States is produced. Weevils were determined by L. L. Buchanan as Ceutorhynchus assilmilis Paykull, and Mr. Buchanan stated that this species had not previously been reported from North America and that it appeared to be of considerable economic importance in Europe.

Three New Records of Aphids (Homoptera: Aphididae) in British Columbia

1959 ◽  
Vol 91 (2) ◽  
pp. 121-121
Author(s):  
A. R. Forbes
Keyword(s):  
United States ◽  
British Columbia ◽  
New Records ◽  
The United States ◽  
Economic Importance ◽  
Sweet Clover ◽  
Northern Limit ◽  
First Time

Myzocallidium riehmi (Börner) was collected from sweet clover at Creston in June, 1957. This is the first time this aphid of potential economic importance has been identified from British Columbia. It occurs throughout the United States (Russell, 1957); in Ontario, Ottawa being near the northern limit of its range (W. R. Richards, in litt.); and was identified for the first time from Manitoba in 1956 (Bird and Robinson, 1957)

United States Foreign Policy in Southern Africa: Third-World Perspectives

1983 ◽  
Vol 21 (4) ◽  
pp. 587-603 ◽  
Author(s):  
Davidson Nicol
Keyword(s):  
United States ◽  
Human Rights ◽  
Reagan Administration ◽  
Third World ◽  
The United States ◽  
Economic Importance ◽  
United States Foreign Policy ◽  
Multilateral Aid ◽  
The Past ◽  
The Government

The past decade has seen an increase in the scope of relationships, both political and economic, between Africa and the United States. These vary with the complexion of the government in power, though some would say that this was more in emphasis than in substance, others definitely not. It is felt by many Africans, nevertheless, that the Carter Administration's emphasis on human rights has now been downgraded by the present Reagan Administration and that, instead, the geopolitics of U.S.–U.S.S.R. rivalry, and the economic importance of developing the private sector at the expense of bilateral or multilateral aid, have been moved to the fore.

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