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Susumba Leaf Beetle Damage L

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Susumba Leaf Beetle Damage L MINISTRY OF AGRICULTURE, R&D Distribution ENTOMOLOGY FACTSHEET JULY 2008 The highest diversification of the genus Leptinotarsa occurs in Mesoamerica with central Mexico thought to be An Insect Pest of Susumba the area of origin. L. undecemlineata is also present in LEPTINOTARSA UNDECEMLINEATA STÅL Colombia, Honduras, El Salvador and Guatemala. In (COLEOPTERA: CHRYSOMELIDAE) 1 Jamaica the pest has been detected in St. Andrew, St. Catherine and Clarendon. Introduction Hosts In June 2006, a sample of susumba (Solanum torvum) In Jamaica this beetle only affects susumba (Solanum from Dallas Castle, St. Andrew was submitted to the Plant torvum Swartz) (Figure 2) which is also knows as Protection Unit infested with an unknown leaf beetle turkey berry, wild eggplant and pea eggplant in other which was later identified as Leptinotarsa countries. In Columbia it also affects the orange berry undecemlineata. In Jamaica susumba/gully bean nightshade (S. lanceolatum Cav.) (Figure 3) and the commonly grows wild on abandoned lands, backyards and giant devil’s fig (S. chrysotrichum Schltdl.) (Figure in gullies and is traditionally used in many dishes 4), all of which are perennial shrubs. including soups, stew chicken and seasoned rice. Though not a crop of economic importance, the Plant Protection Unit has received numerous samples and has sought to inform the public on how to identify and manage this pest Figure 2: problem. Branch of susumba Description (S. torvum) A. Egg mass B. Larvae Figure 1A - C: Life Stages of L. undecemlineata C. Adult The eggs are yellow clumps and laid on the underside of susumba leaves. The larva is yellow with a black Figure 3: Orange berry night shade plant; Berry head and black legs. Mature larvae possess one row and Flower of black spots on each side of the body. The adult beetle is yellowish-brown in colour and … cm (1/2 inch) long (Figures 1A-C). L. undecemlineata closely resembles L. decemlineata (the Colorado potato beetle) both possessing ten black stripes on the wing covers (elytra) and black spots behind the head. However, they differ on the ventral side which is black for L. undecemlineata and brown for L. decemlineata. Figure 4: Giant devil’s fig (S. chysotrichum) 1 Biology and Ecology L. undecemlineata has not been recorded affecting any crop of economic importance and does not pose a Each female is able to produce up to 122 eggs. Each threat to the local agricultural industry. Hence, this egg mass may contain between 67 – 128 eggs and has pest is not of economic importance in Jamaica. two weeks duration. The first instars which emerge may cannibalize other eggs remaining in the mass. Control Strategies The duration of one beetle generation from egg to adult ranges from 107 - 112 days. Cultural: Prune and destroy infested branches and allow re-growth. The plant can be destroyed if it is Damage Symptoms not valuable to the property owner. Adults and larvae feed vigorously on leaves Bio-control: In Jamaica natural enemies attacking L. particularly along the leaf edges (Figure 5). In heavy undecemlineata include the tachinid fly, Myiopharus populations this beetle can de-bark the host stem doryphorae (Diptera; Tachinidae) (Figure 7) and a (Figure 6) and completely defoliate and kill the host predator reduvid bug (Figure 8). Natural enemies plant. attacking L. undecemlineata in Columbia includes two predator ladybird beetles Cyclonida sanguinea, and Chilocorus cacti which are also known to exist in Jamaica and may provide additional control for this pest. Figure 7: Adult of Myiopharus doryphorae, parasitic tachinid fly of Figure 5: Susumba leaf beetle damage L. undemlineata Figure 8: Predator reduvid bug of L. undecemlineata Figure 6: Stem of susumba debarked by larvae of beetle Chemical: The use of insecticides will destroy any natural enemies present. Therefore the treatment of the pest is not Economic Importance being recommended. In the United States several Leptinotarsa spp. For further information contact: including L. undecemlineata has been considered as biocontrol agents for S. torvum and related species Ministry of Agriculture which are considered invasive plants. In addition Research and Development (Bodles) expeditions to Mexico and Honduras have taken Crop and Plant Protection Unit, place to find natural enemies of L. undecemlineata Old Harbour P.O., St. Catherine, Jamaica that can be reared for control of the Colorado potato Phone: (876) – 983 – 2267 or 983 – 2281; beetle, L. decemlineata. Fax: (876) – 983 – 2822 E-mail: [email protected] 2.
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