pecan weevil larvae

The main type of damage is caused by larvae feeding within the nut. Larvae or grubs are legless, creamy white and have reddish-brown heads which grow to 3/5 inch long. It occurs only in north central Texas and is absent from Waco toward the Gulf coast; medically harmless. Abstract Neoaplectana dutkyi and 2 species of fungi were evaluated in laboratory and field tests as pathogens of Curcubio caryae larvae. The first type is when the adult weevils puncture the nuts in early August, causing the nuts to fall after two or three days. Pecan Weevil, Curculio caryae ... Eggs hatch in 5 to 7 days and the larvae feed for 2 to 3 weeks before leaving the nut. Pecan and hickory Damage. One of the most devastating insects on pecans is the pecan weevil. 1987; Holloway 1980. Larvae or grubs are legless, creamy white and have reddish-brown heads which grow to 3/5 inch long. The pecan weevil causes two types of damage. 0000001517 00000 n The pecan weevil, Curculio caryae (Horn), is a dangerous nut pest of pecan found throughout the southern United States and portions of Texas. Adults remain in cells and emerge from the soil a year later. 0000002733 00000 n Larvae chew a clean, round, BB-sized hole in the shell—easily identified as pecan weevil damage (Fig. 1). 0000006107 00000 n 1). Larger chestnut weevil grubs chew an exit hole in the side of the nut and drop to the ground usually before the nuts fall. One to four larvae develop inside each nut and destroy the entire kernel. Two to four larvae within each infested nut can easily destroy the entire kernel. "?��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] Once the larvae hatch, they feed on the kernel for about 35 days. 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. Ovipositional damage. Pecan Weevil. In late fall and early winter, about 42 days after eggs are laid, full-grown larvae chew a 1/8 diameter hole in the shell and drop to the ground. 0000045183 00000 n Pecan Weevil. Before shell hardening, treat if high numbers of weevils are seen or if nut drop caused by weevil feeding is high. Adults cause two types of nut damage, depending on the stage of nut development during attack. 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 head is yellow to brown. 0000001123 00000 n The larvae hatch from the eggs and feed inside the nut, destroying the kernel (Fig. After shell hardening, treat when weevils begin to emerge and continue spraying at 7-10 days interval especially following rainy days. They spend one to two years in th… Pecan weevil: suppression of larvae with the fungi Metarrhizium anisopliae and Beauveria bassiana and the nematode Neoaplectana dutkyi. • In terms of familiar objects, adult pecan weevils and %PDF-1.3 %���� Pecan weevils damage nuts in two ways. (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. Adults can be sampled with emergence traps in the soil or with a beating sheet. ture 4: Several larvae can be found in each infested nut. Note that many pecan growing areas are facing dry conditions, and this may result in drought-delayed emergence well beyond the normal emergence time for this pest, particularly in … 4). Literature: Crocker et al. Scientific Name: Curculio caryae (Horn) Description The adult is a brownish weevil about 3/8 inch long. Several species occur, but the most common is Curculio fulvus Chittenden (Coleoptera: Curculionidae). The pecan weevil causes two types of damage. Pecan weevil pupa. Pecan weevil (Curculio caryae) Figure 3 Adult pecan weevil on a mature nut. are susceptible to this indigenous pest ( Ring et al., 1991 ). 0000003397 00000 n After eggs hatch, young legless larvae feed for about 30-35 days inside pecans. The larvae are cream colored grubs with reddish heads. The head is yellow to brown. The pecan weevil burrows into the nut before the shell hardens and lays eggs, then worms hatch from the eggs and devour the nut. 0000000827 00000 n Adult and larval acorn weevils are similar in appearance to pecan weevils and often occur around homes surrounded by oak trees. The larvae are cream colored grubs with reddish heads. Pecan weevil (Curculio caryae) Figure 3 Adult pecan weevil on a mature nut. Pecan Weevil, Curculio caryae ... Eggs hatch in 5 to 7 days and the larvae feed for 2 to 3 weeks before leaving the nut. The pecan weevil will also breed in hickory nuts. Both the adult and larval stages of pecan weevil cause a serious damage to pecan nuts. The pecan weevil has a predominantly 2-year life cycle co-inciding with masting by its Carya host. Grubs overwinter in earthen cells in the ground. 1974. The pecan weevil will also breed in hickory nuts. Larger chestnut weevil grubs chew an exit hole in the side of the nut and drop to the ground usually before the nuts fall. The egg is attached to the shuck with a creamy white substance visible on the shuck surface. The first type is when the adult weevils puncture the nuts in early August, causing the nuts to fall after two or three days. When fully grown, larvae reach a length of 3/5 inch (Fig. Holloway et al. 0000001144 00000 n The larvae are cream colored grubs with reddish heads. In most years, larvae damage results in the most yield loss. 0000034866 00000 n Koch] (Fagales: Juglandaceae) is an economically important North American nut crop ().The pecan weevil, Curculio caryae (Horn) (Coleoptera: Curculionidae), is a key pecan pest affecting orchard nutmeat yield and quality throughout the Southeastern United States, and portions of Texas and Oklahoma (Payne and Dutcher 1985). 0000004055 00000 n Feeding during the water stage prior to shell hardening causes damaged nuts to drop. Nuts infested with larvae result in complete destruction of the kernel (Calcote 1975). The female’s snout is as long as its body; while the male’s snout is somewhat shorter. Hosts. Click for a hub of Extension resources related to the current COVID-19 situation. Circle traps are useful for weevil monitoring, providing good indications of weevil presence and abundance within an orchard. The pecan weevil burrows into the nut before the shell hardens and lays eggs, then worms hatch from the eggs and devour the nut. The majority of adults emerge from the soil during August and the first week of September. In 1986, W. L. Tedders recov- ered H. bacteriophora Poinar Georgia strain from dead, reddish-colored weevil larvae found in a pecan orchard at Byron, Geor- 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. These species can be a problem in the production of oak trees from seed. 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 0000001298 00000 n The pecan weevil is a pest to start controlling in August and September to prevent discovering problems later this year. Creamy white, legless grubs with reddish-brown heads were also found inside pecans infested with pecan weevil larvae. Pecan weevils cause two types of damage. 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. Learn how to identify damage to pecans caused by the pecan weevil. Traps can be obtained for around $18 each from Pecan Ag Equipment in Bristow, Oklahoma (1-918-367-5529). They have reddish-brown head capsules and chewing jaws (Figure 3). Abstract Neoaplectana dutkyi and 2 species of fungi were evaluated in laboratory and field tests as pathogens of Curcubio caryae larvae. Pecan weevil adults damage pecan each year just before and after initiation of kernel development by feeding directly on the nuts and by oviposition (Boethel and Eikenbary 1979). 0000092691 00000 n The pecan weevil, Curculio caryae (Horn), is perhaps the most damaging insect in the majority of pecan-producing states in the U.S. (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. Later damage caused by larvae feeding on the developing kernels makes the nuts worthless. Ovipositional damage. Biological Control of the Pecan Weevil: Smith et al. Their presence does not stop development of the pecan so they may make it into the harvest. Pecan weevil larvae can be found inside infested pecan nuts before and after nuts are removed or fall from the tree. Biological Control of the Pecan Weevil: Smith et al. Each female weevil can oviposit 30 to 54 eggs; therefore, one weevil could affect as many as 15 to 27 or as few as 7 to 13 pecans, assuming there are two to four larvae per nut, respectively. One to four larvae develop inside each nut and destroy the entire kernel. 0000003833 00000 n The larvae leave the nut and burrow into the soil, remaining there for two to three years before emerging as adults to commence another cycle. Where it is found in Texas, the pecan weevil is the most damaging late-season pecan pest. 0000002283 00000 n 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 . Pecan Weevil Alert Pecan weevil management decision-making is already upon us. As of 1999, pecan weevil had been found in 131 Texas counties (Fig. • Pecan weevil larvae are legless, plump, and creamy white, and their bodies have multiple segments. Pecan weevils are scientifically called as Curculio caryae. • Pecan weevil larvae are legless, plump, and creamy white, and their bodies have multiple segments. 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). In 1986, W. L. Tedders recov- ered H. bacteriophora Poinar Georgia strain from dead, reddish-colored weevil larvae found in a pecan orchard at Byron, Geor- 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. The use of polyvinyl acetate as a barrier to the pecan weevil larvae. Hickory shuckworm, Cydia caryana (Fitch) (Lepidoptera: Tortricidae), larvae occur in shucks of pecan nuts. Pecan weevils damage nuts in two ways. It has also been observed to infest one Juglans species, the Persian walnut, Juglans regia. The head is yellow to brown. Pecan South 2(5): 194–196. 0000002511 00000 n Larvae and pupae become common in flower beds and gardens in which acorns have fallen. Learn how to identify damage to pecans caused by the pecan weevil. Habitat and Food Source(s): Mouthparts are for chewing. Larvae chew a clean, round, BB-sized hole in the shell—easily identified as pecan weevil damage (Fig. 28 0 obj << /Linearized 1 /O 30 /H [ 920 224 ] /L 280752 /E 108681 /N 5 /T 280074 >> endobj xref 28 24 0000000016 00000 n 79 tory conditions and reported 80, 86, and 75% larval mortality, respectively, after 28-35 days. Pecan weevil larvae devour a harvestable pecan. The main type of damage is caused by larvae feeding within the nut. The egg is attached to the shuck with a creamy white substance visible on the shuck surface. They have reddish-brown head capsules and chewing jaws (Figure 3). The larvae leave the nut and burrow into the soil, remaining there for two to three years before emerging as adults to commence another cycle. Their presence does not stop development of the pecan so they may make it into the harvest. Pecan weevil larvae devour a harvestable pecan. Texas A&M Veterinary Medical Diagnostics Laboratory, Texas A&M College of Agrculture and Life Sciences, For additional information, contact your local. The larvae are cream colored grubs with reddish heads. Snout is somewhat shorter ( Fig over 1/2 inch long, with reddish-brown heads occasionally, a number. 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