Reference Report for IND86004941
| Title: | Effects of leaf position, leaf wounding, and plant age of two soybean genotypes on soybean looper (Lepidoptera: Noctuidae) growth. |
| Authors: | Reynolds, G.W., Smith, C.M. |
| Source: | Environ. Entomol. 1985, 14(4):475-478 |
| Abstract: | Growth of the soybean looper, Pseudoplusia includens (Walker), on the folige of soybean, Glycine max (L.) Merr., plant introduction (PI) '227687' was evaluated by measuring growth rate of last-instar larvae for 33 h relative to growth on the susceptible soybean cultivar Davis. The top two fully expanded leaves nearest the apex of 'PI 227687' consistently supported higher larval growth rates than the third and lower leaves. No differences in resistance were observed between leaves below the third leaf. The same trend was also observed among leaves from 'Davis' plants but larval growth rates were from 2- to 6-fold greater on 'Davis' leaves than on corresponding leaves of 'PI 227687'. Larval growth rates supported by 'PI 227687' plants varying in age from 4 to 8 weeks old did not differ when leaves from similar plant locations were compared. Mechanically wounding 'PI 227687' leaves 72 h before assay decreased the growth rates among P. includens larvae fed either greenhouse or field-grown leaves relative to those fed normal, unwounded 'PI 227687' leaves. |
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