scholarly journals Photophase influence on the reproductive diapause, seasonal morphs, and feeding activity of Euschistus heros (Fabr., 1798) (Hemiptera: Pentatomidae)

2002 ◽  
Vol 62 (2) ◽  
pp. 231-238 ◽  
Author(s):  
A. P. M. MOURÃO ◽  
A. R. PANIZZI
Keyword(s):  
Feeding Activity ◽  
Reproductive Organs ◽  
Stink Bug ◽  
Reproductive Diapause ◽  
Laboratory Studies ◽  
Body Color ◽  
Spine Length ◽  
Euschistus Heros ◽  
Glycine Max L ◽  
Diapause Incidence

Laboratory studies were conducted to verify the influence of photophase on diapause incidence in the Neotropical brown stink bug, Euschistus heros (Fabr., 1798), fed with soybean [Glycine max (L.)] Merrill pods. Nymphs were maintained at three different photophases: 10 h, 12 h, and 14 h, with constant temperature of 25 ± 1ºC and relative humidity of 65 ± 5%. With 14 h, aproximately 100% of the adults showed mature reproductive organs; the shoulder (spine) length was significantly greater (2.96 and 2.79 mm for females and males, respectively) than those of bugs maintained at the photophase of 12 h (2.60 mm for females and males) and 10 h (2.59 and 2.53 mm for females and males). At the longer photophase (14 h), E. heros showed better reproductive performance and greater feeding activity than insects reared at 10 h and 12 h; in all photophases bugs tended to reduce feeding from the 1st to the 6th week of life. Body color was considered an unreliable parameter to indicate diapause incidence. However, at 14 h, 60% of the insects were dark brown and 40% were reddish brown. These results indicate that E. heros enters reproductive diapause with photophase of 12 hours or less, showing immature reproductive organs or with intermediate development, with shoulder (spine) less developed and reduced feeding activity.

scholarly journals Diapause and different seasonal morphs of Euschistus heros (Fabr.) (Hemiptera: Pentatomidae) in Northern Paraná State

2000 ◽  
Vol 29 (2) ◽  
pp. 205-218 ◽  
Author(s):  
Ana P. M. Mourão ◽  
Antônio R. Panizzi
Keyword(s):  
Mangifera Indica ◽  
Reproductive Organs ◽  
Stink Bug ◽  
Ligustrum Lucidum ◽  
Mango Tree ◽  
Euschistus Heros ◽  
Males And Females ◽  
Fallen Leaves ◽  
Diapause Incidence ◽  
In The Beginning

The Neotropical brown stink bug, Euschistus heros (Fabr.), was collected on sunflower [Helianthus annuus (L.)], soybean [Glycine max (L.) Merrill], star bristle [Acanthospermum hispidum (DC.)], and under fallen leaves of mango tree [Mangifera indica (L.)] and privet (Ligustrum lucidum Ait.), during one year, to evaluate the diapause incidence and the occurrence of different seasonal morphs. The majority of the insects (ca. 90%) with mature reproductive organs was observed during the summer (December-March), when E. heros was found on soybean or on sunflower; in the beginning of autumn, most insects (87%) showed immature reproductive organs, and they were found on star bristle and under fallen leaves. Bugs with mature reproductive organs had more developed shoulders (3.23 and 3.27 mm, for males and females, respectively) than bugs with immature organs (2.91 and 2.89 mm, for males and females, respectively). Two distinct body colors, dark brown and reddish brown, were observed. Nevertheless, the reddish brown was the predominant color of both mature and immature adults during all year. Adults were parasitized by Hexacladia smithii (Ashmead) (Hymenoptera: Encyrtidae) and Tachinidae mainly Trichopoda giacomellii (Blanchard) (Diptera: Tachinidae) (80% and 40% of parasitism in male and female, respectively) during summer (December), when the bugs colonized sunflower. In soybean, 12% of males and 10% of females were parasitized, whereas in fallen leaves, the parasitism rate was 5% in both sexes.These results showed that in autumn/winter (shorter photoperiod) the majority of the insects were inactive under fallen leaves, showing immature reproductive organs and less developed shoulders, indicating that, at this time, these bugs were in diapause.

Stink Bugs Nymph and Adult Biology and Adult Preference on Cultivated Crop Plants in the Southern Brazilian Neotropics

2019 ◽  
Vol 49 (1) ◽  
pp. 132-140 ◽  
Author(s):  
Taynara Possebom ◽  
Tiago Lucini ◽  
Antônio Ricardo Panizzi
Keyword(s):  
Body Weight ◽  
Triticum Aestivum L ◽  
Cultivated Plants ◽  
Stink Bug ◽  
Stink Bugs ◽  
Laboratory Studies ◽  
Brassica Napus L ◽  
Reproductive Structures ◽  
Glycine Max L ◽  
Adult Preference

Abstract Laboratory studies were conducted with Dichelops furcatus (F.), Euschistus heros (F.), and Nezara viridula (L.) (Heteroptera: Pentatomidae) aiming to evaluate nymph and adult biology and adult preference for immature reproductive structures of the cultivated plants, soybean, Glycine max (L.) Merrill (Fabaceae), wheat, Triticum aestivum L. (Poaceae), and canola, Brassica napus L. var. oleifera (Brassicaceae). Considering the survivorship for D. furcatus nymphs, it was greater on soybean and wheat, for E. heros nymphs it was greater on soybean compared to canola and wheat, and for N. viridula nymphs the survivorship was greater on soybean and canola. Dichelops furcatus nymphs developed faster on soybean and wheat, and E. heros and N. viridula nymphs developed faster on soybean and canola. Body weight at adult emergency for D. furcatus was greater on soybean and wheat, and for E. heros and N. viridula, it was greater on soybean. Adult survivorship and longevity were similar on soybean/wheat/canola for D. furcatus and N. viridula, and greater on soybean for E. heros. Reproduction and weight gain of adults were greater on soybean and wheat for D. furcatus, and on soybean for E. heros; N. viridula reproduced only on soybean and tended to gain greater body weight in this food source. As expected, soybean considering its superior nutritional quality was, in general, the best food. These laboratory studies coupled with field observations allow to conclude that the sequence of soybean/wheat/canola crops in the area studied forms a ‘green bridge’ that favor stink bug populations abundance in southern Brazilian neotropics.

scholarly journals Mating, ovipositional rhythm and fecundity of Nezara viridula (L.) (Heteroptera: Pentatomidae) fed on privet, Ligustrum lucidum Thunb., and on soybean, Glycine max (L.) Merrill fruits

1999 ◽  
Vol 28 (1) ◽  
pp. 35-40 ◽  
Author(s):  
Antônio R. Panizzi ◽  
Ana P.M. Mourão
Keyword(s):  
Glycine Max ◽  
Nezara Viridula ◽  
Stink Bug ◽  
Laboratory Studies ◽  
Ligustrum Lucidum ◽  
Preoviposition Period ◽  
Southern Green Stink Bug ◽  
Glycine Max L ◽  
Green Stink Bug ◽  
Heteroptera Pentatomidae

Laboratory studies were conducted on mating, ovipositional rhythm, and fecundity of the southern green stink bug, Nezara viridula (L.) fed on immature fruits of privet, Ligustrum lucidum Thunb. and soybean, Glycine max (L.) Merrill. A greater number of pairs were observed mating on privet (27 to 37 %) than on soybean (22 to 23 %). The preoviposition period was significantly shorter when females fed on privet (15.5 days) than when they fed on soybean (23.9 days). The intervals of time between the first four ovipositions, and between the 1st and the 4th oviposition were shorter on privet than on soybean (range of 1.9 to 3.3 days less on the former food). Greater percentage of females N. viridula oviposited and showed greater fecundity on privet than on soybean. On privet, the oviposition rhythm peaked at days 11 and 17; however, no peaks on oviposition were observed on soybean.

scholarly journals Sublethal Concentration of Pyriproxyfen Reduces Testicular Connective Tissue Thickness in Euschistus heros Fabr. (Hemiptera: Pentatomidae)

2021 ◽  
Vol 13 (9) ◽  
pp. 27
Author(s):  
Janaina F. Matsumoto ◽  
Paulo S. G. Cremonez ◽  
Samuel Roggia ◽  
Angela M. F. Falleiros ◽  
Sheila M. Levy ◽  
...  
Keyword(s):  
Connective Tissue ◽  
Sublethal Concentration ◽  
Experimental Unit ◽  
Stink Bug ◽  
Hormone Analogue ◽  
Working Pressure ◽  
Morphometric Analyses ◽  
Euschistus Heros ◽  
Different Types ◽  
Randomized Experimental Design

The aim of this study was to determine the effect of the insecticide pyriproxyfen (Tiger™ 100 CE), juvenile hormone analogue, when applied in a sublethal LC30 concentration (0.668 mL a. i. L-1), on the morphological and morphometric parameters of external and internal connective tissue (CT) of the Neotropical-brown stink bug Euschistus heros testicles. The insecticide was applied on nymphs from the 4th instar using a Potter tower with a working pressure of 82.73 kPa (12 lb pol-²) and 1 mL of the emulsion per replicate. A completely randomized experimental design was used, consisting of two treatments (control and pyriproxyfen-treated), five repetitions, and 10 adults of E. heros per experimental unit. The insects were maintained under controlled conditions until the emergence of adults. After 48 h of emergence of adults, the testicles were collected, fixed, and processed for morphological and morphometric analyses. A change was observed in the collagen fibers of the CT of treated insects when compared with those of controls. It was also observed that both types of CT (dense irregular and loose) over the internal tunic of the treated insect were thinner than those in control insects. The analysis showed that pyriproxyfen significantly reduced the external and internal CT width and the conformation of its fibers in all the observed regions when compared with the controls; this may affect the production of the three different types of sperm present in this species.

scholarly journals Parâmetros biológicos de Euschistus heros (Fabricius, 1794) alimentado com diferentes dietas

2021 ◽  
Vol 4 (1) ◽  
pp. 152-159
Author(s):  
Yves Pierre Harry Dalleinne ◽  
◽  
Aline Giothi ◽  
Rosane Betina Wandscheer ◽  
Ivonete Hoss ◽  
...  
Keyword(s):  
Food Preference ◽  
Eating Habits ◽  
Feeding Preference ◽  
Stink Bug ◽  
Euschistus Heros ◽  
Males And Females ◽  
Seeds And Fruits

During their development, insects can suck plant structures like seeds and fruits being the preferred structures. The study aims to monitor the eating habits of these insects are relevant mainly in terms of food preference and development. The objective of this work was to analyze the feeding preference of Euschistus heros (brown stink bug) fed with 5 diets. The different diets studied resulted in insects in adult, with significant differences in the length of the nymph period, differences in the weights of males and females and variation in survival during the experiment.

scholarly journals Pentatomids associated with blackberry

2014 ◽  
Vol 38 (3) ◽  
pp. 256-261
Author(s):  
Mauricio Paulo Batistella Pasini ◽  
Alessandro Dal'Col Lúcio
Keyword(s):  
Rio Grande ◽  
Nezara Viridula ◽  
Brown Spot ◽  
Stink Bug ◽  
Stink Bugs ◽  
Rio Grande Do Sul ◽  
Dark Brown Spot ◽  
Euschistus Heros ◽  
Santa Maria ◽  
Piezodorus Guildinii

Information concerning the presence of stink bugs in blackberry (Rubus spp.) in Brazil is sparse. This study aimed to identify the stink bug species associated with blackberry, to establish the daily dynamics and evaluate the fruits damage. The experiment was conducted in Santa Maria, Rio Grande do Sul State, Brazil, in blackberry orchard. Presence and evaluations of stink bugs were done weekly through visual and sweeping samplings at different day times. Five species of pentatomids were identified: Piezodorus guildinii, Nezara viridula, Euschistus heros, Dichelops furcatus and Edessa meditabunda. The bugs attack the drupelets producing a dark brown spot and wrinkled berries.

scholarly journals Nymph and Adult Performance of the Small Green Stink Bug, Piezodorus guildinii (Westwood) on Lanceleaf Crotalaria and Soybean

2002 ◽  
Vol 45 (1) ◽  
pp. 53-58 ◽  
Author(s):  
Antônio Ricardo Panizzi ◽  
Shirlei Regina Cardoso ◽  
Viviane Ribeiro Chocorosqui
Keyword(s):  
Reproductive Performance ◽  
Adult Emergence ◽  
Adult Longevity ◽  
Stink Bug ◽  
Complete Development ◽  
Adult Performance ◽  
Wild Host ◽  
Glycine Max L ◽  
Green Stink Bug ◽  
Piezodorus Guildinii

Lanceleaf crotalaria, Crotalaria lanceolata E. Mey (Leguminosae) was found hosting the small green stink bug, Piezodorus guildinii (Westwood), in Paraná State, Brazil. In the laboratory, nymphs showed less mortality when fed on immature pods of crotalaria (64%) than when fed on immature pods of soybean, Glycine max (L.) Merrill (88%). From 2nd stadium to adult, nymphs required less time to complete development on crotalaria (mean of females and males = 18.4 days) than on soybean (21.5 days). Fresh body weight at adult emergence was greater on crotalaria (mean of females and males = 51.4 mg) than on soybean (42.2 mg). Adult P. guildinii tended to live longer on crotalaria than on soybean. Mean adult longevity was 34.6 days on crotalaria, and 28.8 days on soybean. However, the reproductive performance of females, although similar on both foods, tended to be greater on soybean. These results indicated that P. guildinii was able to develop and reproduce on the wild host lanceleaf crotalaria. Compared to soybean, this weed plant was more suitable for nymph development, and equally suitable for adult reproduction.

scholarly journals Characterization of the imaginal reproductive diapause of Oebalus poecilus (Dallas) (Hemiptera: Pentatomidae)

2003 ◽  
Vol 63 (4) ◽  
pp. 695-703 ◽  
Author(s):  
R. S. S. Santos ◽  
L. R. Redaelli ◽  
L. M. G. Diefenbach ◽  
H. P. Romanowski ◽  
H. F. Prando
Keyword(s):  
Body Fat ◽  
Sexual Maturation ◽  
Abdominal Cavity ◽  
Reproductive Organs ◽  
Reproductive Organ ◽  
The Body ◽  
Reproductive Diapause ◽  
Male And Female ◽  
In The Beginning

The state of development of the internal reproductive organs of male and female Oebalus poecilus (Dallas) as well as the body fat amount in the abdominal cavity during hibernation, of individuals sampled in bamboo litter in Eldorado do Sul (30º02'S and 51°23'W), RS, Brazil was investigated. Females and males showed the abdominal cavity filled with body fat in the beginning of the hibernation phase. The decrease in fat reserve level occurred from August on for males and from October on for females. Ovaries and testis doubled in length and tripled in width from immature to the reproductive phase. Male sexual maturation occurred in the hibernation sites while for females it occurred later on outside of the sites. Reproductive organ immaturity and abdominal body fat hypertrophy characterized the diapause of O. poecilus.

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