Reference Report for IND81120010
| Title: | Soybean cultural practices: effects on populations of green cloverworm Plathypena scabra, velvetbean caterpillar Anticarsia gemmatalis, loopers and Heliothis complex Mississippi. |
| Authors: | Buschman, L.L., Pitre, H.N., Hodges, H.F. |
| Source: | Env. Entomol. 1981, 10(5):631-641 |
| Abstract: | Insects were monitored in soyabean of early-, medium- and late-maturity groups planted from April to July in several row spacings at 4 locations in Mississippi for 1 to 3 years. Non-damaging populations of Plathypena scabra (F.) were present from June to September, and damaging populations were observed at 1 location after a drought. P. scabra populations were generally higher in late plantings, in late-maturing cultivars and in narrow-row plantings. Damaging populations of Anticarsia gemmatalis Hb. occurred in August or September. In 1976 and 1978, only the June and July plantings were seriously defoliated, but in 1977 all but the early-maturing April and May plantings were seriously defoliated. A. gemmatalis populations were highest in late plantings, late-maturing cultivars and in narrow-row plantings. Populations of Pseudoplusia includens (Wlk.) and Trichoplusia ni (Hb.) were generally less than 1/m2, but populations up to 3.2/m2 occurred at 1 location after insecticide treatment. Effects of planting date, cultivar and row spacing were not consistent. Populations of the Heliothis complex larvae were generally less than 0.05/m2, but populations as high as 3.74/m2 were observed in flowering soyabean. Populations of the Heliothis larvae were about equal in narrow- and wide-row plantings. In wide-row plantings, populations of Heliothis larvae averaged 0.98/m2 in closed canopy and 0.24/m2 in open canopy. |
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