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Soybean nodule fly, Rivellia quadrifasciata (Macquart) eggs were oviposition in the soil and crop residue around the bases of potential larval host plants. Approximately 75% of the egg clutches observed being oviposited in cracks and crevices, in the field, were within 2 cm of the host plant stem (Phaseolus limensis Macf. L.). Most eggs were oviposited within 2 mm of the soil surface but eggs were sometimes deeper when females entered soil cracks and crevices. Oviposition from laboratory colony adults was not observed in the absence of host plants in no-chioce situations. When given a choice between closely arranged pots of soil with and without soybean plants, little oviposition occurred in soil without plants. Significantly (p = &amp;gt; 0.05) more oviposition occurred in pots containing soybean plants with loose soil than with compacted soil surfaces. The short-term responses of females to the absence of appropriate oviposition sites included egg retention and apparent increased flight activity.

INFLUENCE OF SOIL SURFACE CONDITIONS AND HOST PLANT ON SOYBEAN NODULE FLY RIVELLIA QUARDIFASCIATA (MACQUART) (DIPTERA: PLATYSTOMATIDAE) OVIPOSITION1