The female’s snout is as long as its body; while the male’s snout is somewhat shorter. ture 4: Several larvae can be found in each infested nut. The pecan weevil burrows into the nut before the shell hardens and lays eggs, then worms hatch from the eggs and devour the nut. In 2017, nuts collected from residential pecan trees produced live pecan weevil larvae in January. trailer << /Size 52 /Info 26 0 R /Root 29 0 R /Prev 280064 /ID[<8b5080b40d262f6b3a54b5e468d931bc>] >> startxref 0 %%EOF 29 0 obj << /Type /Catalog /Pages 25 0 R /Metadata 27 0 R /PageLabels 24 0 R >> endobj 50 0 obj << /S 62 /L 129 /Filter /FlateDecode /Length 51 0 R >> stream 0000002511 00000 n 0000045183 00000 n No other insects develop in pecan kernels in the field, although larvae of several pests, such as the Indianmeal moth, Plodia interpunctella (Hübner) (Lepidoptera: Pyralidae), can infest stored pecans. The majority of adults emerge from the soil during August and the first week of September. Pecan weevils are scientifically called as Curculio caryae. Weevil larvae feeding in a pecan nut. Life Cycle: Adult weevils and full grown larvae spend the winter in cells, 4 to 12 inches deep in the soil. Common Name: Pecan weevil Scientific Name: Curculio caryae (Horn) Order: Coleoptera Description: Adult pecan weevil adults are 3/8 inch long, brownish beetles with snouts as long as the body. For more information on pecan weevil control and other research-based orchard management practices, consult OSU Extension fact sheets, available online and through all county Extension offices . The larvae are cream colored grubs with reddish heads. One to four larvae develop inside each nut and destroy the entire kernel. For more information on pecan weevil control and other research-based orchard management practices, consult OSU Extension fact sheets, available online and through all county Extension offices . The larvae emerge from the nuts about 42 days after the eggs are deposited. When nuts reach the dough stage of development, mated females lay 2-4 eggs in separate pockets within the kernels. 0000081597 00000 n 0000003169 00000 n Life Cycle and Biology The pecan weevil exhibits four life stages: egg, larva, pupa and adult (Figure 1) and it requires two to three years to complete one generation. The use of polyvinyl acetate as a barrier to the pecan weevil larvae. But it does cause the nuts to be inedible. pecan weevil Curculio caryae (Horn) (Coleoptera: Curculionidae) can be a serious direct pest of pecan nuts across much of the southern U.S.A. All North American Carya spp. They burrow into the soil and construct a cell where they remain for 8 to 10 months before pupating and transform to adults, although some larvae do not pupate and transform to adults until the following year. 79 tory conditions and reported 80, 86, and 75% larval mortality, respectively, after 28-35 days. 1987; Holloway 1980. The objective in a pecan weevil integrated pest management (IPM) program is to prevent female weevils from laying eggs in nuts. Pecan weevils are scientifically called as Curculio caryae. First, they feed on the young nuts in late summer, causing some to drop early still in their husks and never complete development. The larvae are cream colored grubs with reddish heads. 0000002733 00000 n ... Larvae on pecan feed in phylloxera galls in spring. 11). They have reddish-brown head capsules and chewing jaws (Figure 3). Pecan and hickory Damage. Adults of pecan weevil generally emerge from soil in late July to August and move in the tree canopy by either crawling on the trunk or directly flying. 0000000920 00000 n Although feeding The main type of damage is caused by larvae feeding within the nut. Once the larvae hatch, they feed on the kernel for about 35 days. Ma-ture larvae may be about 1/3 to a little over 1/2 inch long. Description The adult is a brownish weevil about 3/8 inch long. (year 3). First, they feed on the young nuts in late summer, causing some to drop early still in their husks and never complete development. It has also been observed to infest one Juglans species, the Persian walnut, Juglans regia. Pecan Weevil. Proc. early egg-laying period, from early August to mid-September. i��qO�sxٱ�|S�F�U-a�]G0�����J���1��9̋ӳ�>c�Y�+?��Q}���f����K�1�O�E��=4���c�n�d�w�a�S�S���{��0i�e/��u�v�Q��0��w�!^g8�A}3��/M������Q��* ������zS&�[,��ϙp��?�m �α�-V�픻�ٶ�A����o����Nو���(�+\@[͍N�ql~��PO"��(�є��ѯ_�T^�:��+���-K�E�d������nt���de��ѷ�`��?Ǘ!�L�K�3��u���e (�G0Ր�����T���5é�3��� |]�j����3"�C��SEz�VR(ؖ���. Descriptions of Larvae Pecan Weevil Larvae (Curculio caryae) These robust, dirty white, somewhat C-shaped larvae are up to 5/8 inch in length when fully grown. The pecan weevil, Curculio caryae is a serious economic pest of pecans (Caryae illinoensis).In late summer, the weevil attacks maturing nuts and damages them when making feeding and/or oviposition punctures. Common Name: Pecan weevil Where it is found in Texas, the pecan weevil is the most damaging late-season pecan pest. 11). From the Southwest Yard & Garden series. Choose blocks that have known history of pecan weevil infestations for monitoring. Oklahoma Pecan Growers Assoc. The pecan weevil, Curculio caryae (Horn), is a dangerous nut pest of pecan found throughout the southern United States and portions of Texas. Mated females chew a hole in the pecan shell and deposit eggs inside. After shell hardening, treat when weevils begin to emerge and continue spraying at 7-10 days interval especially following rainy days. Ovipositional damage. 0000002283 00000 n INTRODUCTION THE PECAN weevil, Curculio caryae (Horn), attacks green maturing nuts in late summer and damages them by making feeding and oviposition punctures. After eggs hatch, young legless larvae feed for about 30-35 days inside pecans. "?��Y���< UI^�!�"�!�� h��N���e�S�[C�%�X���4��"ߥi�4*��3^�+t�G/q,CcʣNA�7���+r653����wg��6Ԃ/k�S�7� tC���ȹZ3m���@&�+�o+���&Tb�bJ:i� 9��5p����WYv�D?���&�c�ߏ�7���.�����Jڡ��'uhk�|9������L}FP�x]C!Q;lɣ�;K] The larvae hatch from the eggs and feed inside the nut, destroying the kernel (Fig. One to four larvae develop inside each nut and destroy the entire kernel. Learn how to identify damage to pecans caused by the pecan weevil. Pecan weevils damage nuts in two ways. 0000006107 00000 n Adult weevils feeding and egg laying on developing (water stage) pecan nuts, causing them to drop from the tree. ture 4: Several larvae can be found in each infested nut. The female’s snout is as long as its body; the male’s snout is somewhat shorter (Fig. Pecan weevil pupa. Pest Status: Larvae feed in developing pecan nuts, causing yield loss. Because the larvae, pupae and adults are covered with 4 to 12 inches of soil and pesticides cannot reach larvae inside the nuts, management of these life stages is not practical. Larger chestnut weevil grubs chew an exit hole in the side of the nut and drop to the ground usually before the nuts fall. Larvae and pupae become common in flower beds and gardens in which acorns have fallen. Traps can be obtained for around $18 each from Pecan Ag Equipment in Bristow, Oklahoma (1-918-367-5529). Hickory shuckworm, Cydia caryana (Fitch) (Lepidoptera: Tortricidae), larvae occur in shucks of pecan nuts. The entire life cycle takes 2 or 3 years. Adults of pecan weevil generally emerge from soil in late July to August and move in the tree canopy by either crawling on the trunk or directly flying. Pecan [Carya illinoinensis (Wangenh.)K. H�b```��|a� bE8:]NM�0=��� �L( b(f`P��0,``�˰��H20�1lg�+����A��OC�O\[�vD�8�� ��� #B� endstream endobj 51 0 obj 112 endobj 30 0 obj << /Type /Page /Parent 25 0 R /Resources 31 0 R /Contents 41 0 R /MediaBox [ 0 0 612 792 ] /CropBox [ 0 0 612 792 ] /Rotate 0 >> endobj 31 0 obj << /ProcSet [ /PDF /Text /ImageC ] /Font << /TT2 36 0 R /TT4 32 0 R /TT6 33 0 R /TT8 39 0 R >> /XObject << /Im1 48 0 R /Im2 49 0 R >> /ExtGState << /GS1 44 0 R >> /ColorSpace << /Cs6 38 0 R >> >> endobj 32 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 32 /Widths [ 250 ] /Encoding /WinAnsiEncoding /BaseFont /BEPPJD+TimesNewRoman,BoldItalic /FontDescriptor 34 0 R >> endobj 33 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 151 /Widths [ 250 0 0 0 0 0 0 0 333 333 0 0 250 333 250 278 500 500 500 500 500 500 500 500 500 500 0 278 0 0 0 0 0 722 667 667 722 611 556 722 722 333 389 722 611 889 722 722 556 0 667 556 611 722 0 944 0 0 0 0 0 0 0 0 0 444 500 444 500 444 333 500 500 278 278 500 278 778 500 500 500 500 333 389 278 500 500 722 500 500 444 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 444 444 0 0 1000 ] /Encoding /WinAnsiEncoding /BaseFont /BEPPKF+TimesNewRoman /FontDescriptor 37 0 R >> endobj 34 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 98 /FontBBox [ -547 -307 1206 1032 ] /FontName /BEPPJD+TimesNewRoman,BoldItalic /ItalicAngle -15 /StemV 133 /FontFile2 42 0 R >> endobj 35 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 656 /Descent -216 /Flags 34 /FontBBox [ -558 -307 2034 1026 ] /FontName /BEPPIB+TimesNewRoman,Bold /ItalicAngle 0 /StemV 133 /FontFile2 43 0 R >> endobj 36 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 250 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 333 0 0 0 0 0 0 722 0 722 722 0 0 0 778 0 0 0 667 944 0 0 611 0 0 0 667 0 0 1000 0 0 0 0 0 0 0 0 0 500 556 444 556 444 333 500 556 278 0 0 278 833 556 500 556 0 444 389 333 556 500 0 0 500 ] /Encoding /WinAnsiEncoding /BaseFont /BEPPIB+TimesNewRoman,Bold /FontDescriptor 35 0 R >> endobj 37 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 656 /Descent -216 /Flags 34 /FontBBox [ -568 -307 2028 1007 ] /FontName /BEPPKF+TimesNewRoman /ItalicAngle 0 /StemV 94 /XHeight 0 /FontFile2 47 0 R >> endobj 38 0 obj [ /ICCBased 45 0 R ] endobj 39 0 obj << /Type /Font /Subtype /TrueType /FirstChar 32 /LastChar 121 /Widths [ 250 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 667 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 500 0 444 0 444 0 0 0 278 0 0 278 0 0 500 0 0 389 0 0 500 0 0 0 444 ] /Encoding /WinAnsiEncoding /BaseFont /BEPPPF+TimesNewRoman,Italic /FontDescriptor 40 0 R >> endobj 40 0 obj << /Type /FontDescriptor /Ascent 891 /CapHeight 0 /Descent -216 /Flags 98 /FontBBox [ -498 -307 1120 1023 ] /FontName /BEPPPF+TimesNewRoman,Italic /ItalicAngle -15 /StemV 0 /FontFile2 46 0 R >> endobj 41 0 obj << /Length 1977 /Filter /FlateDecode >> stream Adult weevils become active in August and early September. Pecan weevil: suppression of larvae with the fungi Metarrhizium anisopliae and Beauveria bassiana and the nematode Neoaplectana dutkyi. They are found in the nuts during late summer and early fall and can be found in the soil beneath infested trees during the rest of the year. Habitat and Food Source(s): Mouthparts are for chewing. One of the most devastating insects on pecans is the pecan weevil. The larvae are cream colored grubs with reddish heads. (Photo by Bill Ree) During my time as the pecan IPM specialist for Texas A&M AgriLife Extension, I have written several articles for Pecan South on pecan weevil management, but for this month instead of a management focus, I would like to address the potential spread of pecan weevil to new areas. 0000003436 00000 n Google Scholar. As of 1999, pecan weevil had been found in 131 Texas counties (Fig. ... Larvae on pecan feed in phylloxera galls in spring. Pecan weevil larvae devour a harvestable pecan. • In terms of familiar objects, adult pecan weevils and Pecan weevil: suppression of larvae with the fungi Metarrhizium anisopliae and Beauveria bassiana and the nematode Neoaplectana dutkyi. Both the adult and larval stages of pecan weevil cause a serious damage to pecan nuts. The head is yellow to brown. Before shell hardening, treat if high numbers of weevils are seen or if nut drop caused by weevil feeding is high. Beneficial nematodes for control of pecan weevils. The adult is a brownish weevil, about 3/8 inch long. Pecan Weevil Alert Pecan weevil management decision-making is already upon us. Weevil larvae feeding in a pecan nut. The pecan weevil, Curculio caryae (Coleoptera: Curculionidae) is an obligate feeder on the nuts of North American hickories and pecans (Carya species), most widely recognized as an economically important pest of the pecan, Carya illinoinensis (Fagales: Juglandaceae). 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