pecan weevil control
Adult pecan weevils are brownish in color and approximately 3/8 of an inch long. To monitor kernel development, cut the distal or tip end of the nutlets of the earliest maturing varieties and check for the beginning of the gel stage. Eradication is considered complete when no pecan weevil larvae are found for four consecutive seasons. After the pecan kernels have been harvested and removed from the orchard, however, other insects can infest the kernels in storage. apply an effective insecticide at the proper time to prevent emerging weevils from laying eggs in susceptible nuts. At the present time, the most effective control measure for the pecan weevil is the use of insecticides directed at the adult weevils in the trees to prevent feeding and, more importantly, egg laying by the females. CD-ROM, Pecan Pest Management. David I. Shapiro-Ilan, Ted E. Cottrell, Clive Bock, Kim Mai, Debbie Boykin, Lenny Wells, William G. Hudson, and Russell F. Mizell, III. The pecan weevil, Curculio caryae (Horn) (Coleoptera: Curculionidae), is a key pest of pecans Carya illinoinensis ([Wangenh.] It is recommended that one trap should be used per tree; no more than a total of 15 traps are needed for 100 acres. When fully grown, larvae reach a length of 3/5 inch (Fig. The time from when the eggs are laid in the pecan to when the larvae emerge is approximately 42 days. 4). We use Facebook Pixel and other cookies to optimize user experience. $36.00–$270.00 3. Controlling Weevil Populations Since most of the life stages of the pecan weevil inhabit protected environments, applications used to control this pest are generally targeted at the adult stage. Pecan weevil activity starts in early August. Trap efficiency is enhanced by keeping grass and weeds mowed around the monitoring trees. Adult weevils collected in the traps should be counted and removed with each inspection. Hard soil acts as a physical barrier to adults moving from their soil cells to the soil. The second wave happens later in the season, after the pecan kernel starts to develop (dough stage). Since this trap works as a visual preference, the tree trunk next to the trap should be painted white to a height of 6 to 8 feet. Regardless of the type of trap used, place traps on or under trees with known weevil infestations. The female’s snout is as long as its body; the male’s snout is somewhat shorter (Fig. If an orchard has several different soil types (sandy, loam, clay), place traps under infested trees growing on the different soils. The trap is painted a, dark color and fitted with a boll weevil trap to collect adults. Insecticides labeled for control of pecan nut casebearer (PNC), hickory shuckworm (HSW), pecan weevil (PW) and pecan phylloxera (PP). Drawer CC, College Station, TX 77841, Download a printer-friendly version of this publication: Controlling the Pecan Weevil, View more Farming and Ranching information ». The key to managing the pecan weevil is to prevent the laying of eggs. Schedule irrigation to ensure weevil emergence at the normal time, but allow time for soils to dry enough to allow pesticide sprayers access before emerging weevils can begin to lay eggs in nuts. Female weevils do not begin laying eggs until 5 days after they emerge from the soil. This will greatly diminish the damage to your crop. Drought-delayed emergence can only be broken when the soil is softened by moisture, either from irrigation or rainfall. If not managed, this weevil can cause severe economic damage to your pecan operation that could last for multiple years. Follow the links below for more information about specific weevil pests. Often this feeding puncture or egg laying site will be surrounded by a circle of tracks created by the adult (Fig. What can be done to prevent this? Pecan weevils , which also feed on all species of North American hickory, can be found from New York to Iowa, south to Oklahoma , and across the south eastern states from Florida to west Texas. 2). Of these techniques, the wire cone trap, pyramid or “Tedders” trap, and the Circle trap are commonly used.
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