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Noctuidae: Spodopotera Chapter 6. Control (1997) found that treating newly-hatched larvae with persin resulted in less weight gain and greater mortality. Bacillus thuringiensis var. Kurstaki Bacillus thuringiensis var. Kurstaki (BT) is a bacterium active against the larval stage of many Lepidoptera. It is formulated as an insecticide. When an insect ingests BT, its digestive system fails. Follow these guidelines for successful control when using BT: • Apply when larvae are small • Apply when temperatures are mild and larvae are actively feeding • Apply the proper concentration of formula Application of other cultural controls Flood fields Cultural controls are not suitable for eradicating this pest. However, a combination of cultural and biological control methods may be useful for managing the pest in non-emergency situations. Cultural control may be subject to obtaining environmental documentation under the National Environmental Policy Act (NEPA) and the Endangered Species Act (ESA). Check with the program manager to make sure documentation is in order. Flood a crop field and allow the water to remain for at least 2 days. Pupae will suffocate (El Amin and Ahmed 1991). Build barriers Contain larvae in a severe infestation by plowing a deep furrow around the infested area or field. The furrow should have straight vertical sides to prevent larvae from crawling out. Dig postholes at a depth of least 1-foot and at a distance of 20 feet apart in the furrow. Destroy larvae trapped in the postholes with soapy water or kerosene. Keep furrows clear of rubbish. Augment with pheromones Hang sticky traps baited with slow-release pheromones to interfere with successful mate-seeking (Campion and Murlis 1985). 36
Noctuidae: Spodopotera Chapter 6. Control Application of biological controls Biological control agents are useful for suppressing pest populations, but rarely eradicate them. Some biological control agents are effective when integrated with insecticides or cultural controls in a pest control program. Researchers speculate that baculoviruses, and the entomopathogenic nematode Steinernema carpocapsae (Rhabditida), may provide some control against many of the spodoptera mentioned in this document. The following list of biological control organisms may be active against spodoptera. Some organisms may require approval from APHIS and/or state regulatory agencies for importation into the U.S. Biological control is a promising tool in pest control. However, the subject is beyond the scope of this document. Conduct additional research before considering these organisms for control of spodoptera. Find helpful links to more information on how to design a program using biological controls in chapter 10. Spodoptera exigua • Orius spp. (Hemiptera: Anthocoridae) (Capinera 1999) • Geocoris spp. (Hemiptera: Lygaeidae) (Capinera 1999) • Nabis spp. (Hemiptera: Nabidae) (Capinera 1999) • Podisus maculiventris (Hemiptera: Pentatomidae) (Capinera 1999) • Solenopsis invicta (Hymenoptera: Formicidae) (Capinera 1999) • Noctuidonema guyanense (Nematoda: Acugutturidae) • Cotesia marginiventris (Hymenoptera: Braconidae) (Capinera 1999) • Chelonus insularis (Hymenoptera, Braconidae) (Capinera 1999) • Meteorus autographae (Hymenoptera: Braconidae) (Capinera 1999) • Frontina archippivora4 (classification unknown) • Lespsia archippivora (Diptera: Tachinidae) (Capinera 1999) • Beauveria bassiana (Fungi: Ascomycota) • Erynia sp. (Entomophthorales: Entomophthoraceae) • Nomurea rileyi (Fungi: Ascomycota) 37
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