Zobrazeno 1 - 10
of 38
pro vyhledávání: '"John L. Hellman"'
Publikováno v:
Transactions of the American Entomological Society. 142:167-213
Mississippi Hydrochidae are poorly known. In this paper, we attempt to untangle some of the taxonomic difficulties caused by recent dubious works of D. Makhan and to validate an undescribed species from previously unpublished research. The 12 species
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::570adf838e9839a8a1c57d545fb87a42
https://doi.org/10.3157/061.142.0206
https://doi.org/10.3157/061.142.0206
Economic Injury Levels for Spodoptera frugiperda (Lepidoptera: Noctuidae) on Silage Corn in Maryland
Autor:
Carlos J. Pereira, John L. Hellman
Publikováno v:
Journal of Economic Entomology. 86:1266-1270
The fall armyworm, Spodoptera frugiperda (J. E. Smith), is a serious pest of corn in Maryland. To estimate the relationship between number of larvae per plant and plant weight at two plant growth stages for single-cultivar stands of silage corn, fiel
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::67ca239495e81451eff6aacc06f148ad
https://doi.org/10.1093/jee/86.4.1266
https://doi.org/10.1093/jee/86.4.1266
Autor:
Meryln Brusven, W. T. Johnson, J. G. Thomas, Robert C. Riley, P. O. Ritcher, M. L. Cleaveland, S. C. Hoyt, J. W. Gentry, P. D. Hurd, R. H. Nelson, L. T. Edmunds, D. W. S. Sutherland, L. M. Riddiford, Samuel C. Billings, D. J. Sutherland, T. R. Fukoto, R. E. Trece, J. C. Owens, E. I. Schlinger, Doprothy Feir, D. C. Rentz, Joseph C. McWilliams, Milton Ouye, R. D. Lauderdale, William H. Whymer, John L. Hellman, J. D. Paschke, T. R. Yonke, J. R. Strayer, J. C. French, D. C. Peters, W. V. Campbell, M. L. Fairchild, Donald B. Johnson, S. H. Shorey, T. A. Miller, R. H. Roberts, J. W. Truman, Curtis W. Sabrosky, Robert C. Thatcher, D. M. Anderson, James V. Robinson, D. L. Bull, Carols M. Ignofo, Richard C. Back, S. A. Hall, H. R. Burke, G. E. Guyer, L. L. Pechuman, E. J. Gerberg, W. G. Eden, Carl A. Johanson, H. Iwan Rainwater, R. H. Kuhr, Waldemar Klassen, A. C. Davis, D. F. Bray, Paul W. Bergman, Hall L. Jones, O. Taboda, Richard J. Sauer, J. D. Lattin, Richard H. Foote
Publikováno v:
Bulletin of the Entomological Society of America. 22:82-85
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4873e47aef3530413a5e0f2f25a25a92
https://doi.org/10.1093/besa/22.1.82
https://doi.org/10.1093/besa/22.1.82
Publikováno v:
Journal of Economic Entomology. 80:612-616
Effect of the ectoparasitic mite, Coccipolipus epilachnae Smiley, on feeding, fecundity, and longevity of adult Mexican bean beetle (MBB), Epilachna varivestis Mulsant, was determined in the laboratory. Field-collected, overwintered adult MBB were te
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::dd6216a4e2c9b0b5a175ee31dcdb1897
https://doi.org/10.1093/jee/80.3.612
https://doi.org/10.1093/jee/80.3.612
Autor:
John L. Hellman
Publikováno v:
Insecticide and Acaricide Tests. 4:119-120
The alfalfa var Saranac AR stand was 3 years old and nearing full bud stage of development at time of treatment. Tip damage levels varied from 30-50% within the test area and precounts average 6 larvae/10 stems. Treatment plots were 10 ft x 10ft and
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b2f4fb796ca8283e3a3cefaec52bdc9
https://doi.org/10.1093/iat/4.1.119a
https://doi.org/10.1093/iat/4.1.119a
Publikováno v:
Insecticide and Acaricide Tests. 4:120-121
Two production locations were selected for this test. The Beltsville site is a sandy loam soil type with the Saranac AR variety of alfalfa. The Denton-Williamsburg alfalfa stand is grown on a sandy soil. The Denton stand was harvested 5 days before t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06a4cc3b6aadcc8b23a6d2a1c599912e
https://doi.org/10.1093/iat/4.1.120a
https://doi.org/10.1093/iat/4.1.120a
Autor:
John L. Hellman, Perry Newton
Publikováno v:
Insecticide and Acaricide Tests. 4:197-198
Seventeen insecticide treatments were applied June 21’77 to a four year old bluegrass commercial sod field that was moderately infested with leafhoppers. Treatment plots were 20 x 20 ft and were arranged in a randomized complete block design with 3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2f54b24f31f4a1b20440053dff1b1e9a
https://doi.org/10.1093/iat/4.1.197a
https://doi.org/10.1093/iat/4.1.197a
Publikováno v:
Insecticide and Acaricide Tests. 4:196-197
A seven year old nursery plot of Penncross bentgrass was selected for the test. The thatch layer varied from a thickness of 1/4 inch to 3/4 inch. At time of treatment the chinch bug injury was moderate to severe. Due to the limited size of the nurser
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1895e20d0b7b3f04aaf156bf7fff4712
https://doi.org/10.1093/iat/4.1.196a
https://doi.org/10.1093/iat/4.1.196a
Publikováno v:
Insecticide and Acaricide Tests. 7:88-89
‘NK-199’ sweet corn was planted in 4-row plots 50 ft in length in Jun 8. Distance between rows was 3 ft. Distance between plants within the row was 8 inches. Treatment plots were replicated 4 times and arranged in a randomized complete block desi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bc14eb35140ed70b9d79789f8cdf57de
https://doi.org/10.1093/iat/7.1.88a
https://doi.org/10.1093/iat/7.1.88a
Autor:
John L. Hellman
Publikováno v:
Insecticide and Acaricide Tests. 4:171-172
Eight insecticides were evaluated for aphid control on maturing wheat. The aphid populations at time of treatment, May 23’77, averaged 102/head in Check I and 127/head in Check II. Wheat was harvested two weeks after treatment. Treatment plots were
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7093a7e67300d578cb80e98e13989261
https://doi.org/10.1093/iat/4.1.171a
https://doi.org/10.1093/iat/4.1.171a