Studies on food consumption, host selection and oviposition preference of the Egyptian alfalfa weevil, Hypera brunneipennis Boh. (Col., Curculionidae)

2009 ◽  
Vol 95 (1-5) ◽  
pp. 175-180
Author(s):  
M. A. Ali
Keyword(s):  
Food Consumption ◽  
Host Selection ◽  
Oviposition Preference ◽  
Alfalfa Weevil ◽  
Hypera Brunneipennis

Influence of Stem Diameter on Oviposition Preference of the Alfalfa Weevil and Its Importance in Breeding for Resistance 1

Crop Science ◽  
1967 ◽  
Vol 7 (5) ◽  
pp. 428-430 ◽  
Author(s):  
B. L. Norwood ◽  
D. K. Barnes ◽  
R. S. VanDenburgh ◽  
C. H. Hanson ◽  
C. C. Blickenstaff
Keyword(s):  
Oviposition Preference ◽  
Stem Diameter ◽  
Alfalfa Weevil ◽  
Breeding For Resistance

scholarly journals Management of the Egyptian alfalfa weevil, Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae), in the alfalfa, Medicago sativa L., using the entomopathogenic fungus, Beauveria bassiana (Balsamo) Vuillemin

2019 ◽  
Vol 29 (1) ◽  
Author(s):  
Monir M. M. El Husseini
Keyword(s):  
Medicago Sativa ◽  
Beauveria Bassiana ◽  
Entomopathogenic Fungus ◽  
Larval Population ◽  
Alfalfa Weevil ◽  
Alfalfa Field ◽  
Medicago Sativa L ◽  
Hypera Brunneipennis ◽  
Fungus Beauveria Bassiana ◽  
Sweep Net

AbstractLarval and adult populations of the Egyptian alfalfa weevil (EAW) Hypera brunneipennis (Boheman) (Coleoptera: Curculionidae) was monitored after application of the entomopathogenic fungus Beauveria bassiana in the alfalfa field (Medicago sativa L.) in two successive seasons 2014/2015 and 2015/2016. The second and last generation of the weevil on April 10, 2016, was controlled by only one application with the conidiospores of the entomopathogenic fungus B. bassiana (3 × 108 spores/ml). Accordingly, the larval population decreased from 16.07 ± 1.09 in season 2015/2016 to 7.37 ± 0.05 individuals/50 sweep net double strokes in season 2016/2017. Also, the adult weevil’s population decreased from 5.66 ± 0.8 to 2.55 ± 0.6 individuals/50 sweep net double strokes in the two seasons, respectively. 39.66% mortality rate was recorded in the Hypera brunneipennis adults aestivated under loose bark of the surrounding eucalyptus trees, which received the application of B. bassiana in the field. Another application with the fungus, targeting the second generation of the pest adults in alfalfa each season, will undoubtedly lead to a further decrease in the pest population.

ECONOMIC INJURY LEVELS OF THE ALFALFA WEEVIL (COLEOPTERA: CURCULIONIDAE)

1973 ◽  
Vol 105 (1) ◽  
pp. 61-74 ◽  
Author(s):  
Philip G. Koehler ◽  
David Pimentel
Keyword(s):  
Food Consumption ◽  
Larval Density ◽  
New York State ◽  
Live Weight ◽  
Dry Weight ◽  
Larval Feeding ◽  
Larval Food ◽  
Alfalfa Weevil ◽  
Second Growth ◽  
Economic Injury

AbstractEconomic injury levels of the alfalfa weevil on alfalfa were investigated in New York State. The dry weight food consumption for the larval stage of the alfalfa weevil averaged 7.34 mg/larva. For every gram (dry weight) of alfalfa consumed, 1.59 g (live weight) in insect tissue was produced. In the laboratory, it was found that insect food consumption could account for only about 50% of the total weight loss in alfalfa plants after 10 days of larval feeding. Therefore, alfalfa weevil damage to alfalfa was more than the larval food consumption, and this was believed to be due to the loss of the plant’s photosynthetic potential. In the field on first growth alfalfa, the economic injury level was calculated to be 56 larvae/stem. First growth alfalfa was less severely injured by alfalfa weevil larvae than our second growth alfalfa infested with equal populations of alfalfa weevils. It was shown that first growth alfalfa was able to compensate for 87% of the insect feeding while second growth alfalfa could compensate for only 50%. Since the alfalfa plant’s capacity to compensate for alfalfa weevil feeding can vary due to environmental conditions and plant characteristics, economic injury levels must be adjustable. To provide more reliability to economic injury levels, we propose that in alfalfa the following seven measurements be made: (1) alfalfa weevil larval density; (2 and 3) parasites and predators of the weevil; (4) rainfall and moisture level; (5) plant nutrients; (6) alfalfa variety; and (7) stage and previous management of alfalfa stand.

Oviposition preference and levels Adaptation of Caryedon serratus Olivier (Coleoptera, Bruchidae) hosts plant strain to groundnut (Arachis hypogaea, Fabaceae)

2011 ◽  
Vol 1 (1) ◽  
pp. 48-55
Author(s):  
Mbacké Sembène Sembène ◽  
Awa Ndiaye ◽  
Ali Doumma ◽  
Toffène Diome ◽  
Assane Ndong ◽  
...  
Keyword(s):  
Site Selection ◽  
Host Selection ◽  
Host Plants ◽  
Oviposition Preference ◽  
The Other ◽  
Oviposition Site Selection ◽  
Selection Principle ◽  
Caryedon Serratus ◽  
Wild Strains ◽  
Wild Hosts

The objective of the present study was to assess oviposition site selection by females of various groundnut seed‐beetle strains, Caryedon serratus, bred from different hosts. Tests of choice on pods of various host plants were initially made. Egg distributions among hosts were compared. The levels of adaptation of wild strains on groundnut and the capacities of development of \"groundnut\" strain on the seeds of the wild hosts were also tested. Results indicated that strains may be considered as developing according to Hopkins\' host selection principle. Results obtained from the levels of adaptation tests revealed that the various strains were as identical as for their intrinsic possibilities of development on the groundnut. The parameter weight of the adults indicated that the “Bauhinia” strain was adapted intrinsically less well than the other strains to the development on the groundnut. The fecundity rate revealed that the various strains were identical as for their intrinsic possibilities of development on the groundnut but “Bauhinia” seemed less good adapted to the groundnut. The passage of the groundnut strain to the wild hosts is possible but, raised on wild seeds; this one behaves although on groundnut.

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