Spermatozoon Counts in Males and Inseminated Queens of the Imported Fire Ants, Solenopsis invicta and Solenopsis richteri (Hymenoptera: Formicidae)

1985 ◽  
Vol 68 (1) ◽  
pp. 162 ◽  
Author(s):  
B. Michael Glancey ◽  
Clifford S. Lofgren
Keyword(s):  
Solenopsis Invicta ◽  
Fire Ants ◽  
Solenopsis Richteri ◽  
Imported Fire Ants

Near Fatal Fire Ant Envenomation of a Newborn

PEDIATRICS ◽  
1992 ◽  
Vol 90 (4) ◽  
pp. 622-624
Author(s):  
WILLUAM E. HARDWICK ◽  
JAMES A. ROYALL ◽  
BRUCE A. PETITT ◽  
SAMUEL J. TILDEN
Keyword(s):  
Solenopsis Invicta ◽  
Fire Ants ◽  
Fire Ant ◽  
Port City ◽  
Southern States ◽  
South Central ◽  
Solenopsis Richteri ◽  
Central United States ◽  
Imported Fire Ants ◽  
Venom Hypersensitivity

Imported fire ants, Solenopsis richteri and Solenopsis invicta, are menacing health hazards for the 20 to 30 million people who live in the fire ant-infested regions of the southeastern and south central United States. In the early 1900s, fire ants were brought into the port city of Mobile, Alabama, on vegetation and produce from South America. Their aggressive behavior compared to native ants and the favorable climate throughout the southeast allowed extensive spread. In 1985 it was estimated that fire ants infested approximately 250 million acres in eleven southern states and Puerto Rico.1 In infested areas fire ants account for 90% of all ant populations and stings from fire ants are more frequent than stings from other hymenoptera, becoming the most common cause of insect venom hypersensitivity.

SUPERCOOLING STUDIES ON THE IMPORTED FIRE ANTS: SOLENOPSIS INVICTA AND SOLENOPSIS RICHTERI (HYMENOPTERA: FORMICIDAE) AND THEIR HYBRID

1989 ◽  
Vol 24 (3) ◽  
pp. 361-364 ◽  
Author(s):  
Stan K. Diffie ◽  
D. Craig Sheppard
Keyword(s):  
Solenopsis Invicta ◽  
Parental Species ◽  
Fire Ants ◽  
Fire Ant ◽  
Cold Temperatures ◽  
Northern Latitude ◽  
Solenopsis Richteri ◽  
Lower Temperature ◽  
Imported Fire Ants

The discovery of hybrid fire ants, Solenopsis invicta × S. richteri, in northwest Georgia at a more northern latitude than S. invicta led to an investigation into the hybrid's ability to withstand cold temperatures. This study was undertaken to determine if the hybrid would supercool at a lower temperature than either parental species. Major workers, male alates, and female alates of the three ant types were collected, and supercooling points were determined. Of the three castes tested, only male alates of the hybrid and S. richteri had lower supercooling points than did S. invicta. The inhabitance of north Georgia by the hybrid fire ant and not S. invicta does not seem to be determined by supercooling.

Statewide Survey of Imported Fire Ant (Hymenoptera: Formicidae) Populations in Tennessee

2009 ◽  
Vol 44 (2) ◽  
pp. 149-157 ◽  
Author(s):  
Jason B. Oliver ◽  
Robert K. Vander Meer ◽  
Samuel A. Ochieng ◽  
Nadeer N. Youssef ◽  
Eva Pantaleoni ◽  
...  
Keyword(s):  
Solenopsis Invicta ◽  
Cuticular Hydrocarbon ◽  
The State ◽  
Fire Ants ◽  
Fire Ant ◽  
Virus Genotype ◽  
Solenopsis Richteri ◽  
Solenopsis Invicta Buren ◽  
Imported Fire Ants ◽  
Imported Fire Ant

Imported fire ants (Solenopsis spp.; Hymenoptera: Formicidae) occupy 54 counties (~5.4 million ha) in Tennessee. To better understand the fire ant species distribution in Tennessee, the state was divided into 16.1 × 16.1 km grids, and a single colony was sampled for cuticular hydrocarbon and venom alkaloid analyses within each grid. A total of 387 samples was processed from which 9 (2.3%), 167 (43.2%), and 211 (54.5%) were identified as red (Solenopsis invicta Buren), black (Solenopsis richteri Forel), or hybrid (S. invicta × S. richteri) imported fire ants, respectively. The S. invicta was only found near metropolitan Nashville in Davidson and Williamson counties and at one site in Decatur Co. All samples east of Franklin Co. were identified as hybrids. Tennessee counties west of Lincoln were predominantly S. richteri (86.5%) as opposed to hybrid (13.0%) and S. invicta (0.5%). The exception was Hardin Co., which was predominantly hybrid. Counties containing both hybrid and S. richteri (all in the middle and western part of the state) included Bedford, Decatur, Franklin, Giles, Hardeman, Hardin, Haywood, Lawrence, Lincoln, Marshall, Maury, McNairy, Perry, and Wayne. The S. invicta samples collected from one Williamson Co. site were determined to be polygyne and infected with the Solenopsis invicta virus (genotype SINV-1 A). This was the first detection of polygyne imported fire ant in Tennessee. The SINV-1 A virus was also a new find at the time of detection, but has been previously reported. The survey results are being used to direct current and future biological control efforts against imported fire ants in Tennessee.

scholarly journals Red Imported Fire Ants (Hymenoptera: Formicidae) Cover the Insecticide-Treated Surfaces with Particles to Reduce Contact Toxicity

2021 ◽  
Author(s):  
Chao Wen ◽  
Liming Sheng ◽  
Jian Chen ◽  
Jianlong Zhang ◽  
Ying Feng ◽  
...  
Keyword(s):  
Insecticide Resistance ◽  
Surface Treatment ◽  
Solenopsis Invicta ◽  
Behavioral Responses ◽  
Fire Ants ◽  
Contact Toxicity ◽  
Covered Area ◽  
Imported Fire Ants ◽  
Red Imported Fire Ants

Abstract Surface treatment is commonly used in controlling the red imported fire ants, Solenopsis invicta Buren. In the present study, the behavioral responses of S. invicta workers to surfaces treated with insecticides were investigated. Toxicological tests showed that beta-cypermethrin had the highest contact toxicity (with the lowest LC50 value) among nine tested insecticides, followed by thiamethoxam, fipronil, indoxacarb, chlorfenapyr, rotenone, spinetoram, avermectin, and chlorantraniliprole. In the laboratory, surfaces treated beta-cypermethrin or rotenone significantly reduced the number of foraging ants. In addition, S. invicta workers transported significantly more particles (measured in weight and/or covered area) onto surfaces treated with fipronil (50, 500, and 5000 ppm), rotenone (5000 ppm), or avermectin (5000 ppm) compared with the controls. Similarly, these insecticides significantly triggered the particle-covering behavior of ants in the field. We hypothesized that such behaviors would reduce the contact toxicity of insecticides against S. invicta. When the surfaces treated with fipronil or rotenone (500 or 5000 ppm) were artificiality covered with particles, S. invicta had significantly higher LT50 values compared with insecticide-treated surfaces without particles. This study provides the first evidence that S. invicta workers can perform particle-covering behavior to reduce the toxicity of certain insecticides, which constitutes a unique insecticide-resistance strategy in ants.

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