Resistance in Soybeans to the Mexican Bean Beetle: II. Reactions of the Beetle to Resistant Plants¹

Abstract

Mexican bean beetles (Epilachna varivestis Mulsant) displayed differential preference reactions when fed foliage from resistant soybean (Glycine max (L.) Merrill) genotypes PI 229358, PI 227687, and PI 171451. These reactions included reduced longevity and fecundity in adults and weight loss and high mortality in larvae. These symptoms appeared similar to starvation and hypothetically resulted from reduced consumption of resistant foliage by the insects.Larvae tended to fall from plants of the genotypes PI 229358 and PI 171451 possibly because lack of feeding stimulants or presence of repellents caused high larval movement and leaf surfaces provided poor footing for the insects.

Antibiotic Effect of Insect-resistant Soybean on Common Cutworm (Spodoptera litura) and its Inheritance

“…Reduction of pupal weight and extension of the larval period are often observed in many insect species fed on insect-resistant lines (Van Duyn et al 1972, Hatchett et al 1976, Lambert and Kilen 1984a, 1984b, Beach et al 1985. The multiple insect-resistant Sodendaizu gave significantly less larval growth than Fukuyutaka, indicating that our bioassay using only the 6th instar was an appropriate method for evaluating the antibiotic effect of soybean on CCW.…”

Sulfhydryl‐reagent alteration of soybean resistance to the cabbage looper, Trichoplusia ni

“…Four soybean (Glycine max (L.) Merr.) accessions or cultivars (i.e., the highly insectresistant PI 227687 and PI 229358 [Van Duyn et al, 1971 ], the less insect-resistant 'Davis', and an unnumbered PI obtained from the Jacob Hartz Seed Co., Stuttgart, AR) were grown from seeds treated with Thiram (Science Products, Chicago, IL) and germinated in sterilized vermiculite in plastic flats. The young cotelydonary seedlings were transplanted singly into earthen pots (15.5cm diam) containing 1000 cc of the sterilized potting mixture (field soil, sand and vermiculite; 2:1:1).…”

Chemoreceptors of adult Mexican bean beetles: External morphology and role in food preference

“…It was used to screen, from among hundreds of genotypes of soybean, a few with high levels of resistance to foliage-feeding arthropods (Van Duyn et al, 1971). with regard to possible physiological processes associated with resistance (Van Duyn et al, 1972;Kogan, 1972;Tester, 1977;Dreyer et al, 1979;Smith & Brim, 1979;Grunwald & Kogan, 1981;Hart et al, 1983;Binder & Waiss, 1984). exp.…”