Irv Wisniewski, UM Football 1948

(crop from 1949 team photo bl001230)

Predation potential and biology of Protogamasellopsis posnaniensis Wisniewski & Hirschmann (Acari: Rhodacaridae)

Rhodacaridae are cosmopolitan mites mentioned as predators, although nothing is known about their potential as biological control agents. One of the objectives of the work reported in this paper was to evaluate the potential of Protogamasellopsis posnaniensis (Acari: Rhodacaridae) as predator of representative species of insects of the families Sciaridae (Bradysia matogrossensis (Lane)) and Thripidae (Frankliniella occidentalis (Pergande)), of mites of the family Acaridae (Tyrophagus putrescentiae (Schrank) and Rhizoglyphus echinopus (Fumouze & Robin) and of nematodes of the family Rhabditidae (Protorhabditis sp.). Another objective was to determine the biological cycle of P. posnaniensis when fed the prey on which it performed best in the preceding predation test. The study was conducted in a laboratory where the experimental units were maintained at 25 +/- 1 degrees C, 97 +/- 3% RH and in the dark. Although the predator was able to kill all prey species considered in this study, the most favorable prey were T. putrescentiae, F. occidentalis and Protorhabditis sp. Survivorship of the predator in predation tests was always 98% or higher. Life table biological parameters when the predator was fed T. putrescentiae were: R(o) = 109.29; T = 19.06 days; lambda = 1.28 e r(m) = 0.32 female/female/day. Despite preying upon larvae of B. matogrossensis, eggs of the former can also be killed by the latter. The results indicated that A posnaniensis is a promising biological control agent, deserving additional studies on its possible use for the control of soil pests. (C) 2008 Elsevier Inc. All rights reserved.

Vern Ummel and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, 1985.

Vern Ummel and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Clara Irvin Chapman, Thurmond Clarke Memorial Library Heritage Room, Chapman College, Orange, California

Clara Irvin Chapman's last visit to the Chapman campus was in March, 1967 for the opening of the Thurmond Clarke Memorial Library. She is in the Heritage Room by a portrait of her late husband, Charles Clarke Chapman, for whom the college is named.

Irvin [Ernie] Clarke Chapman in California Christian College football uniform. Los Angeles, California, 1930

Irvin [Ernie] Clarke Chapman in football uniform on the campus of California Christian College, Los Angeles, California, 1930.

Clara Irvin Chapman, Thurmond Clarke Memorial Library Heritage Room, Chapman College, Orange, California

Clara Irvin Chapman's last visit to the Chapman campus was in March, 1967 for the opening of the Thurmond Clarke Memorial Library. She is in the Heritage Room by a portrait of her late husband, Charles Clarke Chapman, for whom the college is named.

Clara Irvin Chapman, Thurmond Clarke Memorial Library Heritage Room, Chapman College, Orange, California

Clara Irvin Chapman's last visit to the Chapman campus was in March, 1967 for the opening of the Thurmond Clarke Memorial Library. She is in the Heritage Room of the library.

Cecilia and Randall Presley, Irvin C. "Ernie" Chapman, and C. James Beneley at a Chapman College event in 1983

Honorees [left to right] Cecilia and Randall Presley, Irvin C. "Ernie" Chapman, and C. James Beneley at a Chapman College event in 1983. Cecilia Presley is the granddaughter of Cecil B. DeMille. [Chapman Quarterly, Winter 1983]

Clara Irvin Chapman, Thurmond Clarke Memorial Library Heritage Room, Chapman College, Orange, California

Clara Irvin Chapman's last visit to the Chapman campus was in March, 1967 for the opening of the Thurmond Clarke Memorial Library. She is in the Heritage Room by a portrait of her late husband, Charles Clarke Chapman, for whom the college is named.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Liz Lin and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985

Liz Lin and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.