Laboratory studies were conducted to determine the effect of two prey species, Agonoscena pistaci... more Laboratory studies were conducted to determine the effect of two prey species, Agonoscena pistaciae Burckhardt and Lauterer (Hemiptera: Aphalaridae) and Aphis gossypii Glover (Hemiptera: Aphididae) on the biology, reproduction, and food consumption indices of Coccinella septempunctata L. (Coleoptera: Coccinellidae). Both species of prey were readily consumed by C. septempunctata larvae and adults. The predator was able to successfully utilize the psylla prey for larval development, but failed to lay eggs when fed this prey. However, A. gossypii fully supported both development and reproduction of C. septempunctata. Dry mass of ingested food was similar on both diets for each larval instar. However, the dry mass gained during each stadium for C. septempunctata was significantly greater with A. gossypii prey. The aphid diet was superior to the psylla diet in terms of food conversion efficiency as larvae consumed aphids more efficiently than psyllas, regardless of the higher consumption index on the psylla prey. Our results confirm that the study of prey suitability for larvae and adult stages of predatory lady beetles should be studied separately.
The cucumber moth, Diaphania indica (Lepidoptera: Pyralidae), is one of the most destructive pest... more The cucumber moth, Diaphania indica (Lepidoptera: Pyralidae), is one of the most destructive pests of cucurbitaceous plants all over the world. Previously, we showed that volatile organic compounds (VOCs) from cucumber plants play a crucial role in guiding gravid D. indica females to oviposition sites, whereas watermelon VOCs did not, and females significantly prefer cucumber over watermelon for oviposition. It remained unclear, however, whether preferred and non-preferred host plants also affect moth reproductive behaviors. In the present study we investigated the effect of preferred and non-preferred host plants on female calling, male attraction to female sex pheromone, and mating behavior in D. indica. In the presence of cucumber, virgin females engaged in significantly more calling on the first night than in either the watermelon treatment or the control. Also, we found that the mean time per bout on the first night in the cucumber plant treatment was significantly higher than that of the other two groups. The combination of cucumber foliage with female pheromone significantly increased the attraction and landing of males compared to either watermelon or the control in the wind tunnel. Furthermore, for one-day-old insects mating occurred only in the cucumber treatment. All insects in the cucumber treatment exhibited their first mating on one of the first three nights, but in the watermelon treatment only by night four had all insects mated. We also found that the duration of first mating in cucumber was significantly greater than in either watermelon or control. Overall, our study provides evidence that preferred and non-preferred host plants affect reproductive behaviors in D. indica.
International Journal of Tropical Insect Science, 2018
Ladybeetles are known beneficial insects, with a long history in augmentative and classical biolo... more Ladybeetles are known beneficial insects, with a long history in augmentative and classical biological control. The ladybeetle Oenopia conglobata (L.) is a natural enemy of many herbivores, particularly aphids. The temperature-dependent development of O. conglobata was studied at six constant temperatures (22.5, 25, 27.5, 30, 32.5 and 35 °C) to understand its development rate and environmental constraints better. Linear and nonlinear (Lactin) models were fitted to the data. In the thermal range from 22.5 to 32.5 °C, the rate of development increased for all stages; 35 °C was lethal for all stages and no eggs hatched. The Tb and K values for the biological cycle (egg–adult) were 8.84 °C and 263.15 DD, respectively. Depending on the model, tmin values for the total development time of the coccinellid ranged from 8.45 to 8.82 °C. The nonlinear model of Lactin estimated the optimum and upper temperature thresholds for the total development time of the ladybeetle to be 33.2 and 35.0 °C, ...
Surveys for egg-parasitoid wasps were conducted in Rafsanjan, Iran, on two species of Pentatomida... more Surveys for egg-parasitoid wasps were conducted in Rafsanjan, Iran, on two species of Pentatomidae (Hemiptera) found in pistachio orchards, Acrosternum arabicum Wagner and Brachynema signatum Jakovlev. Five species of Scelionidae (Platygastroidea) were recovered, including one that is here described as new: Psix saccharicola (Mani), Trissolcus colemani (Crawford), T. darreh Talamas sp. nov., T. perepelovi (Kozlov), and T. semistriatus (Nees). In addition to describing a new species, we report new host associations, provide COI barcodes for four of these species, and discuss host-related intraspecific variation in T. darreh and T. perepelovi.
The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is one of the most im... more The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is one of the most important and destructive pests of citrus in the world, because of its ability to vector bacteria Candidatus Liberibacter americanus and Candidatus Liberibacter asiaticus, the presumed causal pathogen of Huanglongbing (HLB) or greening disease. The biology and reproduction parameters of D. citri were studied at 27.5°C on four host plants corresponding to the four major varieties cultivated in Iran, namely, Marsh grapefruit (Citrus paradisi), local sour orange (C. aurantium), Mexican lime (C. aurantifolia), and Campbell Valencia orange (C. sinensis). The average developmental period of total nymphal stages and total cycle (egg to adult) were significantly longer on Campbell Valencia orange (21.2 and 24.1 days, respectively) than on other host plants. The mean of pre-oviposition period on four host plants varied (2.4-4.0 days) and was significantly longer on Campbell Valencia orange (4 days)...
This is the author’s final, peer-reviewed manuscript as accepted for publication. The publisher-f... more This is the author’s final, peer-reviewed manuscript as accepted for publication. The publisher-formatted version may be available through the publisher’s web site or your institution’s library. This item was retrieved from the K-State Research Exchange (K-REx), the institutional repository of Kansas State University. K-REx is available at
Psix saccharicola (Mani) and Trissolcus semistriatus (Nees) are the most abundant eggs parasitoid... more Psix saccharicola (Mani) and Trissolcus semistriatus (Nees) are the most abundant eggs parasitoids of the stink bug, Acrosternum arabicum Wagner, in pistachio orchards and have the potential to contribute to their suppression. However, treatment of orchards with broad-spectrum insecticides may greatly reduce populations of these beneficial natural enemies. Therefore, we conducted risk assessments and evaluated sublethal impacts of two insecticides routinely used in pistachio orchards: the organophosphate fenitrothion and a formulated mixture of the neonicotinoid thiamethoxam and the pyrethroid lambda-cyhalothrin on parasitism success, emergence and sex ratio of P. saccharicola and T. semistriatus. Based on the values of their risk quotients (RQ), which are derived from toxicity data, the two insecticide products would be classified as slightly-to-moderately toxic although an alternative metric, the safety factor (SF), showed them to be highly risky. Assessments of sublethal effects ...
Laboratory studies were conducted to determine the effect of two prey species, Agonoscena pistaci... more Laboratory studies were conducted to determine the effect of two prey species, Agonoscena pistaciae Burckhardt and Lauterer (Hemiptera: Aphalaridae) and Aphis gossypii Glover (Hemiptera: Aphididae) on the biology, reproduction, and food consumption indices of Coccinella septempunctata L. (Coleoptera: Coccinellidae). Both species of prey were readily consumed by C. septempunctata larvae and adults. The predator was able to successfully utilize the psylla prey for larval development, but failed to lay eggs when fed this prey. However, A. gossypii fully supported both development and reproduction of C. septempunctata. Dry mass of ingested food was similar on both diets for each larval instar. However, the dry mass gained during each stadium for C. septempunctata was significantly greater with A. gossypii prey. The aphid diet was superior to the psylla diet in terms of food conversion efficiency as larvae consumed aphids more efficiently than psyllas, regardless of the higher consumption index on the psylla prey. Our results confirm that the study of prey suitability for larvae and adult stages of predatory lady beetles should be studied separately.
The cucumber moth, Diaphania indica (Lepidoptera: Pyralidae), is one of the most destructive pest... more The cucumber moth, Diaphania indica (Lepidoptera: Pyralidae), is one of the most destructive pests of cucurbitaceous plants all over the world. Previously, we showed that volatile organic compounds (VOCs) from cucumber plants play a crucial role in guiding gravid D. indica females to oviposition sites, whereas watermelon VOCs did not, and females significantly prefer cucumber over watermelon for oviposition. It remained unclear, however, whether preferred and non-preferred host plants also affect moth reproductive behaviors. In the present study we investigated the effect of preferred and non-preferred host plants on female calling, male attraction to female sex pheromone, and mating behavior in D. indica. In the presence of cucumber, virgin females engaged in significantly more calling on the first night than in either the watermelon treatment or the control. Also, we found that the mean time per bout on the first night in the cucumber plant treatment was significantly higher than that of the other two groups. The combination of cucumber foliage with female pheromone significantly increased the attraction and landing of males compared to either watermelon or the control in the wind tunnel. Furthermore, for one-day-old insects mating occurred only in the cucumber treatment. All insects in the cucumber treatment exhibited their first mating on one of the first three nights, but in the watermelon treatment only by night four had all insects mated. We also found that the duration of first mating in cucumber was significantly greater than in either watermelon or control. Overall, our study provides evidence that preferred and non-preferred host plants affect reproductive behaviors in D. indica.
International Journal of Tropical Insect Science, 2018
Ladybeetles are known beneficial insects, with a long history in augmentative and classical biolo... more Ladybeetles are known beneficial insects, with a long history in augmentative and classical biological control. The ladybeetle Oenopia conglobata (L.) is a natural enemy of many herbivores, particularly aphids. The temperature-dependent development of O. conglobata was studied at six constant temperatures (22.5, 25, 27.5, 30, 32.5 and 35 °C) to understand its development rate and environmental constraints better. Linear and nonlinear (Lactin) models were fitted to the data. In the thermal range from 22.5 to 32.5 °C, the rate of development increased for all stages; 35 °C was lethal for all stages and no eggs hatched. The Tb and K values for the biological cycle (egg–adult) were 8.84 °C and 263.15 DD, respectively. Depending on the model, tmin values for the total development time of the coccinellid ranged from 8.45 to 8.82 °C. The nonlinear model of Lactin estimated the optimum and upper temperature thresholds for the total development time of the ladybeetle to be 33.2 and 35.0 °C, ...
Surveys for egg-parasitoid wasps were conducted in Rafsanjan, Iran, on two species of Pentatomida... more Surveys for egg-parasitoid wasps were conducted in Rafsanjan, Iran, on two species of Pentatomidae (Hemiptera) found in pistachio orchards, Acrosternum arabicum Wagner and Brachynema signatum Jakovlev. Five species of Scelionidae (Platygastroidea) were recovered, including one that is here described as new: Psix saccharicola (Mani), Trissolcus colemani (Crawford), T. darreh Talamas sp. nov., T. perepelovi (Kozlov), and T. semistriatus (Nees). In addition to describing a new species, we report new host associations, provide COI barcodes for four of these species, and discuss host-related intraspecific variation in T. darreh and T. perepelovi.
The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is one of the most im... more The Asian citrus psyllid, Diaphorina citri Kuwayama (Hemiptera: Psyllidae), is one of the most important and destructive pests of citrus in the world, because of its ability to vector bacteria Candidatus Liberibacter americanus and Candidatus Liberibacter asiaticus, the presumed causal pathogen of Huanglongbing (HLB) or greening disease. The biology and reproduction parameters of D. citri were studied at 27.5°C on four host plants corresponding to the four major varieties cultivated in Iran, namely, Marsh grapefruit (Citrus paradisi), local sour orange (C. aurantium), Mexican lime (C. aurantifolia), and Campbell Valencia orange (C. sinensis). The average developmental period of total nymphal stages and total cycle (egg to adult) were significantly longer on Campbell Valencia orange (21.2 and 24.1 days, respectively) than on other host plants. The mean of pre-oviposition period on four host plants varied (2.4-4.0 days) and was significantly longer on Campbell Valencia orange (4 days)...
This is the author’s final, peer-reviewed manuscript as accepted for publication. The publisher-f... more This is the author’s final, peer-reviewed manuscript as accepted for publication. The publisher-formatted version may be available through the publisher’s web site or your institution’s library. This item was retrieved from the K-State Research Exchange (K-REx), the institutional repository of Kansas State University. K-REx is available at
Psix saccharicola (Mani) and Trissolcus semistriatus (Nees) are the most abundant eggs parasitoid... more Psix saccharicola (Mani) and Trissolcus semistriatus (Nees) are the most abundant eggs parasitoids of the stink bug, Acrosternum arabicum Wagner, in pistachio orchards and have the potential to contribute to their suppression. However, treatment of orchards with broad-spectrum insecticides may greatly reduce populations of these beneficial natural enemies. Therefore, we conducted risk assessments and evaluated sublethal impacts of two insecticides routinely used in pistachio orchards: the organophosphate fenitrothion and a formulated mixture of the neonicotinoid thiamethoxam and the pyrethroid lambda-cyhalothrin on parasitism success, emergence and sex ratio of P. saccharicola and T. semistriatus. Based on the values of their risk quotients (RQ), which are derived from toxicity data, the two insecticide products would be classified as slightly-to-moderately toxic although an alternative metric, the safety factor (SF), showed them to be highly risky. Assessments of sublethal effects ...
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