Effects of Leaf Position, Leaf Wounding, and Plant Age of Two Soybean Genotypes on Soybean Looper (Lepidoptera: Noctuidae) Growth

1985 ◽  
Vol 14 (4) ◽  
pp. 475-478 ◽  
Author(s):  
Gary W. Reynolds ◽  
C. Michael Smith
Keyword(s):  
Plant Age ◽  
Leaf Position ◽  
Soybean Genotypes ◽  
Soybean Looper ◽  
Lepidoptera Noctuidae

Preimaginal Development of Cotesia marginiventris (Hymenoptera: Braconidae) in Soybean Looper (Lepidoptera: Noctuidae) on Insect-Resistant Soybean Genotypes2

1991 ◽  
Vol 26 (4) ◽  
pp. 381-389 ◽  
Author(s):  
G. S. McCutcheon ◽  
M. J. Sullivan ◽  
S. G. Turnipseed
Keyword(s):  
Developmental Time ◽  
Cotesia Marginiventris ◽  
Soybean Genotype ◽  
Breeding Lines ◽  
Preimaginal Development ◽  
Soybean Genotypes ◽  
Glycine Max L ◽  
Soybean Looper ◽  
Lepidoptera Noctuidae ◽  
Resistant Genotypes

The preimaginal development of the parasitoid Cotesia marginiventris (Cresson) was observed in soybean looper, Pseudoplusia includens Walker, on different genotypes of soybean, Glycine max (L.) Merrill. Larvae were reared from eclosion on resistant soybean breeding lines, ED73-371 and D75-10230, both having PI 229358 as the resistance source, or on susceptible cultivars, ‘Bragg’ and ‘Braxton.’ Parasitized larvae consumed less foliage than nonparasitized larvae. Parasitized larvae, regardless of soybean genotype, also weighed less than nonparasitized larvae that fed on susceptible varieties. The developmental time of C. marginventris intrahost was not affected by the hosts' feeding on resistant germplasm. In field cages which contained only one of the soybean genotypes (no choice), parasitization of soybean looper among soybean genotypes was significantly greater in loopers collected from resistant genotypes for one generation during 1986. The resistant genotypes also had greater percentages of undeveloped parasitoids.

scholarly journals Interactions among insect-resistant soybean genotypes extracts with populations of Anticarsia gemmatalis Hübner (Lepidoptera: Noctuidae) susceptible and resistant to its nucleopolyhedrovirus

2009 ◽  
Vol 81 (4) ◽  
pp. 861-871 ◽  
Author(s):  
Giorla C. Piubelli ◽  
Flávio Moscardi ◽  
Clara B. Hoffmann-Campo
Keyword(s):  
Control Diet ◽  
Harmful Effect ◽  
Anticarsia Gemmatalis ◽  
Pupal Weight ◽  
Leaf Extracts ◽  
Resistant Genotype ◽  
Biological Insecticide ◽  
Soybean Genotypes ◽  
Diet Control ◽  
Lepidoptera Noctuidae

Anticarsia gemmatalis nucleopolyhedrovirus (AgMNPV) is being used in Brazil as a biological insecticide. Host plant resistance of soybean to insects is been searched for and some authors have mentioned the interference of plant chemistry in virus efficiency. Interactions among soybean extracts of genotypes used as a source of resistance (PI 274454 and PI 227687) with different AgMNPV concentrations in populations of A. geatalis susceptible (S) and resistant (R) to the virus were studied at laboratory condition. Higher mortality was observed when larvae fed on diets with extracts of the soybean genotypes compared with those fed on a plain diet (control). The mean lethal concentration (LC50) was reduced about 10 ties in the S-population fed on diets containing PI 274454 extracts and different concentrations of AgMNPV, compared to control diet. Additive effect was predominantly observed when larvae fed on diets with extracts of soybean genotypes (PI 274454 and PI 227687) and AgMNPV for both larval populations. The pupal weight was negatively influenced by the extracts incorporated to the diets compared to control, for both larval populations, notably for R-population. The results suggest that, in general, leaf extracts of soybean resistant genotype did not cause any harmful effect on virus efficiency.

Field-evolved resistance to chitin synthesis inhibitor insecticides by soybean looper, Chrysodeixis includens (Lepidoptera: Noctuidae), in Brazil

Chemosphere ◽  
2020 ◽  
Vol 259 ◽  
pp. 127499
Author(s):  
Regis F. Stacke ◽  
Daniela N. Godoy ◽  
Venicius E. Pretto ◽  
Fábio M. Führ ◽  
Patricia da S. Gubiani ◽  
...  
Keyword(s):  
Chitin Synthesis ◽  
Synthesis Inhibitor ◽  
Chitin Synthesis Inhibitor ◽  
Soybean Looper ◽  
Lepidoptera Noctuidae ◽  
Chrysodeixis Includens
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