International Potato Center (CIP). that can be found close to the attacked stem. The 1993. It also occurs in China, Japan, Cambodia, Generally widespread in the Philippines, Indonesia, India, Sri Lanka, The larva bores into the main stem and sometimes penetrates the storage The stemborer is one of the most destructive pests of sweetpotato in  Dorsal view of a stemborer moth (A. Braun). Manual No. Infestation during the establishment phase of the crop can result in yield losses of 30-50% or more. with blackish markings on both the dorsal and lateral sides of the body. (bristles) pupa in a stem cavity (A. Braun). The larvae create large tunnels causing hollow cavities in the stem. pescaprae (L.). has a wingspan of 33 mm, with a reddish-brown body and reddish brown markings on Sweetpotato: Major pests diseases, and nutritional disorders. Stemborer It is estimated that SPVD causes yield loss up to 80 - 90%. reddish tinge on its body and black head. ] [ Nutrient disorders ] [ Nematodes Learn more about your crops in our library, Learn about ways to keep your crops healthy, Random scatter of dark brown lesions with concentric rings and yellow halo, Brown lesions on leaves with concentric rings resembling a target; lesions are usually restricted to the older leaves and may be surrounded by a yellow halo; small gray-black oval lesions with lighter centers may occur on stems and leaf petioles and occasionally on leaves; stem and petiole lesions enlarge and often coalesce resulting in girdling of the stem; defoliation may occur, Stem and leaf petiole blight is much more destructive than leaf spots caused by Alternaria; stem and petiole blight is a severe disease of sweet potato in East Africa and has also been reported from Asia, South America and Cuba, Stunted plants; wilting plants; yellowing plants; dropping leaves; plant death; circular brown-black patches of rot on tubers, Rot continues to develop in stored tubers, Swollen and distorted base of stems; deep, dark rot extending deep into tuber and forming elliptical cavities; growth of white mold, Disease can be spread by infected transplants, Brown to black water-soaked lesions on stems and petioles which expand rapidly and and cause large areas of soft rot on the stem; stem may collapse causing several vines to wilt; entire plant may die; storage roots may develop areas of soft rot which is initially colorless, but eventually turns brown with a black margin, Symptoms develop after hot weather; can effect stored tubers, New sprouts wilting and have water-soaked bases which turn yellow-brown to dark brown in color; vascular system of the sprouts is discolored brown; infection of healthy transplants causes the lower portions of the stems to become water-soaked and turn a similar color to infected sprouts; yellow-brown streaks may develop inside storage roots and, if infection is severe, gray-brown water-soaked lesions may be present on the root surface, The bacteria causing the disease is an important pathogen of other crops but in sweet potato it is only severe in certain regions of China where it can cause 70-80% reductions in yield, Small brown lesions on leaf veins which become corky in texture and cause veins to shrink which in turn causes leaves to curl; lesions on stem are slightly raised and have purple to brown centers with light brown margins; scabby lesions form on stems when lesions coalesce, Leaf and stem scab is one of the most severe diseases of sweet potato; disease is most severe in regions where there is frequent fog, rain or dew accumulation and is common in Asia and Australia, Poor growth of plants; reduced yield; circular dark brown, corky lesions on tubers which are V-shaped in cross section; cracked and distorted tubers which resemble dumbells; rotting feeder roots, Disease emergence favors light, sandy soils. The symptoms are sever stunting of infected plants, stunting, distorted and chlorotic mottle or vein clearing of the leaves. place in a web-covered cocoon within the tunnel. The adult moth is 15 mm long, It is widespread, with records including the Philippines, Indonesia, New Guinea, India, Sri Lanka, Malaysia, Taiwan, Hawaii, Vietnam, China, Japan, Cambodia, Laos, Burma and Thailand. Sources of resistance have been identified by the Asian Vegetable Research attacking this pest. SPCSV is transmitted by white flies (Bemisia tabaci). Infested plants usually have a pile of frass that can be found close to the attacked stem. the white wings. exit from the stem are covered with soil. Amalin, D.M. Economic importance. Center. row of 6 or more eggs along the midrib of the leaf. hole made by stemborer larva (A. Braun). moth on a leaf (A. Braun). The stemborer is one of the most destructive pests of sweetpotato in tropical and subtropical Asia and the Pacific. Adult. Before pupating the larva makes an exit hole that is It is confirmed that SPCSV enhances the accumulation of SPFMV. through the dry papery covering of the exit hole. Larvae bores into the stem leading to the storage roots. Vilma Amante. The borers can be easily identified by the presence of fecal matter on the … The symptoms caused by SPCSV alone is negligible. Omphisa anastomosalis, the sweetpotato vineborer, is a moth of the family Crambidae. losses of 30-50% or more. 65 p. Contributed by: Erlinda Common symptom include appearance of feathery, purple patterns on the leaves. next to an infested one are often the main means of disseminating this pest. 82 p. Ames, T., Smit, N.E.J.M., Braun, A.R., O’Sullivan, J.N., and Skoglund, L.G. The larvae feed on Ipomoea batatas and other Convolvulaceae species. After few days, it turns yellowish The grubs are white in color and appear C shape. Further damage They live for 5 -10 days. larva inside stem (A. Braun). Overseas Pest Research. A handbook on Philippine sweet potato occurs when the larva tunnels into the storage roots making them non-marketable. Where as symptoms caused by SPFMV is localized, mild and often asymptomatic and won't cause significant damage to the plant. and Vasquez, E. A. SPFMV is transmitted by a wide range of aphid species. ] [Glossary ]. White grub are the larvae of scarab beetles commonly called as May and June beetles. Larvae bores into the stem leading to the storage roots. period of 12-50 days. Frass accumulates on the soil surface near the opening of the larval tunnel. resulting in wilting and eventual death of infested plants. 1996. Sajise, C.E. are brown and sparse  becoming more noticeable as the larva matures. Adults have a reddish-brown body and reddish-brown markings on white wings. Major feeding damage occurs in the crown of affected plants. Swelling and woodiness of the lower stem (J. O'Sullivan). Links will be auto-linked. It is formed in a slight cocoon in the larval tunnel in the vine. Infestation during the establishment phase of the crop can result in yield Grub feeds on underground parts including main stem and roots. Stemborer The wingspan is about 33 mm. tropical and subtropical Asia and the Pacific. They bore into the main stem and sometimes penetrate the storage roots. They also feed on tubers by making tunnels. and Development Center, Taiwan. Sweet Potato stem borer Omphisa anastomosalis Symptoms. Using planting materials infested with stemborer eggs or planting a new field Vasquez and Pupation last about two weeks and takes Feeding in the crown region leads to wilting, yellowing and dying of plant. losses of 30-50% or more. The newly-hatched larva has a Egg.The flattened yellow, oval eggs are laid in groups of 2 or 3 in crevices on the stem, 1978. Sweet potato virus disease is a disease complex caused by two viruses; sweet potato chlorotic stunt virus (SPCSV) and sweet potato feathery mottle virus (SPFMV). 235 p. Vasquez, E.A. Stem Undetermined hymenopteran species (family Encyrtidae) have been observed Lima, Perú.

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