0000056380 00000 n Controlling weed growth suppresses thrips buildup, reducing migration into orchards. 0000057058 00000 n To reduce resistance, it is recommended that growers spray three times consecutively with the same insecticide. Pesticides are often used to control western flower thrips (Frankliniella occidentalis) in horticultural crops. Note that once harvesting has commenced, it may be difficult to follow the insecticide management plan recommended and observe withholding periods. WFT damage potential is due not only to its ability to directly damage greenhouse-grown crops by feeding on leaves and flowers, but also because they may vector destructive tospoviruses. The most effective strategy is to incorporate biological control into management. Control is not usually necessary because western flower thrips rarely cause economic damage. Diagram. H�\��n�@���CDBO+�Hi�J9�n�i���"5��C�~��W��H0l�ov�]�F�������]l�^�kj����lQ��kƯ��ڜ�!�-x��z��c�U�����eL7w�n���g���j���ݽo��.�_��S�G7w��k�h�~�����.��f�����6���'�n��b�_P��[�u���'ͪ�+W�ر�4�����a�c�Q��*��|n��#��!o�[��L~6���m1.�xI^�=ك�,�@����u=�z��S��5X��U�V�Z%j��_"��S�)�x Check the pH of the water used in spraying as pH affects the activity of insecticides. Adults have feathery wings and vary from yellow to dark brown. 0000009227 00000 n %PDF-1.4 %���� There must be at least a three week break (at less than 20°C) or a two week break (above 20°C) before another series of sprays is applied. Use insect-proof screening on your greenhouse. Control thrips prior to flowering where possible. Trials have indicated that the maximum hole size for the exclusion of thrips is 0.192mm. 0000017664 00000 n 0000017271 00000 n 0000054893 00000 n Adults have two sets of narrow, clear, nearly veinless wings that have dark, hairy, fringes. Photo 4 Whitney Cranshaw, Colorado State University, Bugwood.org. A shortened version of the URL, helpful when communicating the URL over email or verbally. Sprays applied to control thrips disrupt biological control of other pests such as twospotted spider mites and lygus bugs. A shortened version of the URL, helpful when communicating the URL over email or verbally. Western flower thrips (WFT), Frankliniella occidentalis, is still one of the most destructive insect pests of commercial greenhouses feeding on a wide variety of horticultural crops. Control of western flower thrips can be aided by preventing growth of weedy areas in and adjacent to orchards. Adult male WFT are light yellow, while adult female WFT are a little larger than the males and vary in color from light yellow, yellow with brown splotches, to dark brown. Western flower thrips, the primary thrips species encountered by greenhouse producers, is extremely polyphagous, feeding on a wide-variety of horticultural crops grown in both commercial and research greenhouses. 0000043091 00000 n Produced with support from the Australian Centre for International Agricultural Research under project PC/2010/090: Strengthening integrated crop management research in the Pacific Islands in support of sustainable intensification of high-value crop production, implemented by the University of Queensland and the Secretariat of the Pacific Community. h�b```b``]�������A���b�,k88��.��|?��P�CC�CNA"+_���؀������= '-��c8����#����+j����a^.��sm���T�x$MB>^a?��c����(V�Q��M�sв�?o=}۶�`�5_9㒚ژ9DV.V�:��z�����|��׶ؤ5.^��o`��ƴ���+--L3��D�- �L��H1 Western flower thrips, Frankliniella occidentalis, are likely the most serious pest of greenhouse crops in the world. Consider treating only if populations reach 10 thrips per blossom (UC-Davis). 2011). Sticky traps should be placed in the empty greenhouse to attract many of the remaining adult thrips. When populations develop resistance to one or more pesticides, this usually has a negative impact on Integrated Pest Management (IPM) programs that have chemical control as one of the components. Nymph of western flower thrips, Several species of beneficial insects and mites have become commercially available in Australia. All life stages can be found year-round. At this temperature, an adult female produces an average of 76.6 eggs in her lifetime (Zhang et al. 0000005248 00000 n Mixing is likely to increase the levels of resistance in the thrips population since you are exposing thrips to multiple insecticides, rather than just one. Page last updated: Friday, 9 December 2016 - 2:15pm, Chemical control of western flower thrips, Australian Pesticides and Veterinary Medicines Authority, Biosecurity and Agriculture Management Act, Western Australia's agriculture and food sector, Casual, short-term employment and work experience. A female lives for 30 to 45 days and can produce 150 to 300 eggs during her lifetime. 0000007521 00000 n If thrips are not present, then there is no need to spray. c��XA���Lg��0�L9�,p:�eM^���O`�O���%�Kؗ�/a_���K�w tptptptptptp����5�d�=�5%�iܧ�ôuQ�����E��� 0 v�� endstream endobj 62 0 obj <> endobj 63 0 obj <>stream 0000056689 00000 n It takes western flower thrips 3.07, 1.78, 2.38, 1.00, and 2.04 days to complete the egg, larva I, larva II, prepupal, and pupal stages respectively. Western flower thrips. 0000050828 00000 n Tomato spotted wilt virus transmitted by the western flower thrips, 0000001965 00000 n AUTHOR Grahame JacksonPhoto 1 T Smith, University of Massachusetts.Bugwood.org. This mini fact sheet is a part of the app Pacific Pests, Pathogens & Weeds. R. Chris Williamson, Turf and Ornamental Specialist Revised: 4/25/2004 Item number: XHT1022 . Reserve the insecticides recommended for the control of western flower thrips until you find it in your crop. In Western Australia, populations tend to peak in spring (mid-late October) and autumn (March-May). Thrips have spread throughout the horticulture industry on plugs, cuttings, and small plants. Like all insects, the rate that western flower thrips completes a life cycle depends on temperature. Any thrips in egg or pupal stages will hatch and subsequently die. However, western flower thrips is regarded to be a 'pesticide-induced problem', having developed resistance to pesticides from different chemical classes. 0000062945 00000 n When thrips enter the flowers they are difficult to contact with insecticides as they are hidden. 0000005910 00000 n Management to prevent or delay the development of resistance is necessary for increasing the chances of effective chemical control. Photo 4. Mass trapping involves distributing sticky traps over a large area such as a greenhouse. Do not mix insecticides! Photo 2. A neutral pH is best (6.5-7.0). 0000049868 00000 n 0000003375 00000 n 0000006351 00000 n 0000025048 00000 n In Australia these include synthetic pyrethroids, organophosphates, carbamates, and the newer, narrow-spectrum pesticides such as spinosad. Department of Primary Industries and Regional Development's Agriculture and Food division is committed to growing and protecting WA's agriculture and food sector. 0000015122 00000 n 0000004050 00000 n Either remove or control weeds within and near your crop/orchard. 0000002495 00000 n 0000013748 00000 n Photo 5 Jack T Reed, Mississippi State University. Spread by short flights, and by the plant trade. Pesticides are often used to control western flower thrips (Frankliniella occidentalis) in horticultural crops. Screening is expensive and since you need to cover all vents and doorways, air circulation is reduced and extra venting may be required. 0000113149 00000 n Larvae rese… WFT damage potential is due not only to its ability to directly damage greenhouse-grown crops by feeding on leaves and flowers, but also because they may vector destructive tospoviruses.