Abstract
The major insect-pests observed attacking soybean variety JS 335 were girdle beetle, Obereopsis brevis; tobacco caterpillar, Spodoptera litura; green semilooper, Chrysodeixis acuta; whitefly, Bemisia tabaci and jassids, Empoasca kerri. The peak activity of girdle beetle (1.0 damaged plant per meter row) was observed during first week of October. Whereas the peak activity of caterpillar pests that is, S. litura (2.5 larvae per meter row) and C. acuta (0.7 larvae per meter row) was recorded during second fortnight of August and that of sucking pests that is, B. tabaci (3.2 whiteflies per plant) and E. kerri (3.4 jassids per plant) was recorded during last week of August and Second week of August, respectively. The biocontrol agent’s three species of lady bird beetle, Menochilus sexmaculata, Coccinella septumpunctata and Coccinella transversalis and orb weaver spider, Neoscona sp. were found predating mainly upon whiteflies and jassids. Whereas, lynx spider, Oxyopes sp. and a predatory pentatomid bug, Eocanthecona furcellata was noticed sucking the body sap of lepidopterous larvae. The peak activity of lady bird beetle in second week of August and September with 0.4 grub and adult per plant, whereas the predatory pentatomid bug and spider is both last week of August with 1.1 and 1.2 bugs and spider per plant respectively. Key words: Girdle beetle, caterpillar, sucking pests and soybean.
Highlights
Soybean (Glycine max) is a wonder crop of twentieth century
Researchers in many parts of India have confirmed that seed yield and seed quality are being adversely affected by major insect pests viz. girdle beetle, tobacco caterpillar, green semilooper, jassids and white fly
During the course of study, five insects species, viz., Girdle beetle, Obereopsis brevis tobacco caterpillar, Spodoptera litura, green semilooper, Chrysodeixis acuta, Jassids, Empoasca kerri and white flies, Bemisia tabaci were recorded as the major pests on soybean, variety JS- 335 causing damage at various stages of the crop
Summary
Soybean (Glycine max) is a wonder crop of twentieth century. It is an excellent source of protein and oil. It is a two-dimensional crop as it contains about 40 to 42% high quality protein and 20 to 22% oil. Gangrade (1976) reported that over 99 insect species attacking soybean crop at Jabalpur. Researchers in many parts of India have confirmed that seed yield and seed quality are being adversely affected by major insect pests viz. Girdle beetle, tobacco caterpillar, green semilooper, jassids and white fly. Sum common insect pest complex infesting soybean crops are Green Semilooper, Tobacco Caterpillar, White fly, Girdle beetle etc. Reported by Kumawat (2007).
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