Robert Davis

• University of Central Lancashire

A sublethal concentration (2.5%) of tricalcium phosphate, a known insect population suppressant, was used to investigate the effect of this salt on the energy budget of the khapra beetle, Trogoderma granarium Everts. Larvae fed tricalcium phosphate had a longer developmental period and one extra instar; they ingested more food and had a lower mean...

Three new species of eriophyid mites - Platyphytoptus warkus from Pinus elliottii Engelm. (Pinaceae), Apodiptacus liquidambarus from liquidambar styraciflua L. (Hamamelidaceae) and Diptiloplatus pulaski from Rhus glabra L. (Anacardiaceae) - are described. All species were collected from the coastal barrier islands near Savannah, GA, U.S.A.

Grain mites reared on wheat germ at 21±1°C and 85% r.h. were treated (acclimated) as adults at 0, 14, 28 or 33°C for 1 or 4 days. Fecundity, longevity and numbers of F1 females and males produced were compared. A treatment of 1 day was enough to acclimateAcarus siro and change the studied developmental parameters. Acclimation always lowered fecundi...

Various chemicals commonly found in food (twelve monosaccharides, nine sugar alcohols, twenty triglycerides, eleven unsaturated fatty acids and nine saturated fatty acids) were tested in different concentrations for their ability to attract and sustain feeding by the dried-fruit mite,Carpoglyphus lactis (L.). Oleic acid, -d-glucose and some triglyc...

Gamma radiation at doses higher than 10 krad significantly lowered the fecundity of the grain mite,Acarus siro. The fecundity of irradiated females was inversely correlated with dose, both when control or irradiated males were used in the pairing. Irradiation with ionizing radiation affected sexual activity of males. At doses above 10 krad the numb...

Thirty-two different mineral salts were added individually to a diet of whole wheat flour to investigate their effects on population numbers, times of development and longevity of the Mediterranean flour moth, Anagasta kuehniella (Zeller). The effect upon the time of development varied from inhibitory to no effect to very stimulatory. All tested sa...

Various chemicals commonly found in food (17 amino acids, 9 saturated and 11 unsaturated fatty acids, 7 triglycerides, 12 monosaccharides, 9 sugar alcohols, and 23 vitamins) were tested in different concentrations for their ability to attract and sustain feeding by the mold mite, Tyrophagus putrescentiae (Schrank). Within a given biochemical class,...

Fecundity, longevity and survival to adulthood ofAcarus siro (L.) at constant and alternating temperatures were compared. Both fecundity and longevity were affected by alternating temperatures but the effect of the frequency of alternations was not significant. Significantly higher fecundity and longer life spans were recorded at constant temperatu...

Mating of unirradiated Acarus siro L. females with normal and gamma irradiated males was studied. Females usually laid eggs throughout their life span if they were mated at least once a week with normal males. Females paired with treated males contained spermatophores but did not lay any eggs. Previously mated fertile females of A. siro subsequentl...

Eggs, inert deutonymphs and young, virgin adults of Rhizoglyphus echinopus (Fumouze and Robin) and Aleuroglyphus ovatus (Troupeau) were treated with 5, 10, 15, 20, 40, 60, 80, and 100 krad of gamma radiation. Fecundity, egg viability, oviposition period, survival of developmental stages, and longevity of females were compared. Doses ≥ 40 krad compl...

Populations of protogynes and deutogynes of Acutus fockeui (Nalepa and Trouessart) were examined morphologically and biologically when collected from and reared on different species of Prunus. Morphological comparisons showed that protogynes from different hosts were significantly different from each other as were the protogynes and deutogynes on t...

Nine species of eriophyid mites are described, 3 from Poland: Aceria malvacearum n.sp., Aculus malvae n.sp., and Epitrimerus tanaceti n.sp.; 5 from Brazil: Aculus pitangae n.sp., A. cauliflorus n.sp., A. catappae n.sp., A. solani n.sp., and Phyllocoptes caseariae n.sp.; and, 1 from Colombia: Calacarus guerreroi n.sp. /// Son descritas nueve especie...

Untreated females of the mold mite, Tyrophagus putrescentiae (Schrank), were crossed with both irradiated and untreated males, and effects of the order of pairings on the fecundity, egg viability, productivity of females, and sex ratio of progeny were studied. Untreated females crossed with males irradiated with a 60-, 80-, or 100-krad dose laid on...