Pirate bugs actively feed on larvae (campylomma have also been observed within infested leaves). Feeding on terminal leaves reduces terminal growth and may distort limb growth; leaves may drop prematurely. As the pest has gained importance in British Columbia the need to understand how well these biological controls agents are controlling ALCM in Nova Scotia is required. This parasitoid is beeing considered for importation into the Pacific Northwest. It is distributed throughout the Fraser Valley and in central parts of the Okanagan Valley. A threshold of 30 adults/trap/week is used for timing insecticide sprays. 1, 2). Betina bertelur di lipatan daun apel. The apple leaf midge and its control. This cecidomyiid fly was first recorded in 1964 in New Brunswick on Canada’s eastern seaboard. Minute pirate bugs, Orius spp. The larvae feed on apple leaves causing them to curl upwards. Larval feeding causes leaves to curl tightly upwards and the tissue to thicken, often displaying a purplish color (Figs. In New York scouts reported injured leaves observed during the pre-bloom period, caused by the 1st generation of this pest, and this week in Massachusetts caused by the … Apple. Native and introduced parasitoids attack midge larvae in New Brunswick but no information is available on parasitoids attacking apple leaf midge in BC. Hand removal and destruction of infested leaves may help but removing terminal leaves can result in the same impact on tree development. Snip off a few of the unhealthy leaves and study them, looking for any powder or stickiness on the top or the underside of the leaf. Kolbe W, 1982. Proper management of susceptible trees will help minimize the impact of the midge. In recent years, the pest has spread across Europe, North America and New Zealand. Agriculture Canada is … In Eastern Canada, the introduced European parasitoid Platygaster demades has been shown to effectively reduce (40-90%) the first generation leaf curling midges. Apple leaf midge damage. Larvae feed on the upper surface of leaves for 2-3 weeks. endstream endobj 122 0 obj <. Growers may prefer to reserve its use for difficult to control aphid species such as woolly aphid and rosy apple aphid. 170 0 obj <>stream Ripcord (cypermethrin), Decis (deltamethrin) and Movento (spirotetramat) are registered for control of apple leaf midge. Apple leaf curling midge (ALCM) is an important pest across Canada apple production regions. Apple leaf-curling midge (Dasineura mali Kieffer) (ALCM) is considered as an important quarantine pest of apple due to fresh fruit contamination by pupal cocoons. endstream endobj startxref h�bbd```b``��+@$�>�&f;�e��ٓ�d%X�!��|��`r"�\�= fG�H�(ɨ"�_�HMA)U"e@"�`��� �9̎�`��@dq&��ϼ�� �r��iN�g`Z� � R�� Adult male - Male resembles female but lacks reddish abdomen. (H. Philip), Figure 3. Mature apple leaf midge larvae. Leaf curling from larvae can be seen in orchards from petal fall through harvest. This pest is mostly an issue on newly grafted trees, where it can destroy the terminal end and destroy the grafted plant. Leaf damage can easily be seen visually; break open the curled leaves to find larvae. (H Philip), Figure 2. 2005. Leafcurling symptoms. Hosts. 121 0 obj <> endobj Figure 1. MacPhee AW, Finnamore DB, 1978. Apple Leaf Curling Midge. The larvae grow as they feed. The presence of this insect is confirmed by yellow or orange larvae inside the curled leaves. 151 0 obj <>/Filter/FlateDecode/ID[<28E722285D77524C8786C2B873D162FB><4A89879D27069F429B578D3800DE859B>]/Index[121 50]/Info 120 0 R/Length 132/Prev 351457/Root 122 0 R/Size 171/Type/XRef/W[1 3 1]>>stream Biological control of apple leaf-curling midge in Canada A European biological control agent may help control an exotic pest of apple trees in western Canada. Application interval for Movento is  a minimum of 14 days with a maximum of 2 applications per year. Apple leaf curling midge (Dasineura mali) is an exotic plant pest not present in Australia.This pest is a serious threat to Australia’s apple industry. Adults begin to emerge in late May to early June and during their one week life span, mate and lay eggs on the edge of terminal apple leaves. Its entry to the state may have significant economic and environmental impacts to California’s apple industry and ornamental apple trees. 3). 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