Maize leafhoppers and maize thrips are widespread but irregular in Queensland, and can rapidly re-infest crops after spraying meaning more than one spray may be required. Male aphids are very rare, and females give birth to living young without mating. Larvae typically shelter in the soil during the day and curl into a ´C´ shape when disturbed. The adults are somewhat rectangular, about 2 mm long, mostly without wings (Photo 3). WEED MANAGEMENT IN MAIZE. Seed treatments help deter feeding. Host range – Sorghum, Maize, Rice, Millets. Adults and nymphs suck sap and produce honeydew. For general information about soil insects and germinating seed baits (GSB) see How to monitor for and recognise soil insects . Female moths lay eggs on the stem, leaves (both sides) tassels, silks and husks on the upper two-thirds of plants. Look for ants that are attracted to the aphids' honeydew. Therefore, for effective management of maize lethal Sugarcane mosaic virus necrosis disease, management of aphid vectors is critical. Losses depend on the variety, stage of infection and environmental conditions. For aphid transmission assays, a virus-free colony of R. maidis was reared on detached leaves from healthy plants of maize (Zea mays L.) in a growth chamber under 25 ± 1 °C and a photoperiod of 14 L:10D h. Maize can be attacked by a wide range of insects. All parts of the maize plant are subject to injury, although aphid infestation produces the greatest damage in the tassel, causing varying degrees of barrenness. The aphid produces an abundance of honeydew on which molds grow. Large numbers of aphids occur on maize "tassels" (the male flowers) preventing the development of pollen (Photo 1). Adults and nymphs feed by piercing and sucking on developing cobs, and may severely deform cobs. Maize can be attacked by a wide range of insects. Scientific name: Rhopalosiphum maidis. Two-spotted mite is a widespread but irregular pest of maize during seed fill to maturity. It is grown for fodder as well as for grain. However, insecticides are considered essential for management of aphid The aphid is one of the most economically damaging pest on maize. Spray when caterpillars are feeding (dusk-night). False wireworm larvae attack germinating seeds and seedling roots and shoots in spring, resulting in patchy stands. Feeding damage also occurs on the top 1-3 cm of the cob, and may result in the presence of mycotoxins. Peanut aphid density throughout the whole growth period (from 31-May to 19-August) significantly differed between treatments (F 2, 378 = 72.1, P < 0.0001, Fig. Schröder & K. Krüger* Department of Zoology and Entomology, University of Pretoria, … NATURAL ENEMIES Aphid populations are controlled by environmental factors, several parasitic wasps, fungal diseases, ladybird beetles, syrphid fly larvae, and lacewing larvae and adults. Feeding by this aphid causes yellow mottling, but this damage is seldom of economic importance. MANAGEMENT Many commercial corn hybrids are highly tolerant of the disease and no control is needed; control aphid populations on plants and remove any Johnson grass growing in the vicinity as … The corn leaf aphid sucks sap from plants and deposits a sticky substance called "honeydew." on wheat. Feeding on secondary roots may cause the plants to fall over as they get larger. Scouting for either aphid species should start before tasseling - probably too late for that this year. Maize stem borer, Chilo partellus (Lepidoptera: Pyralidae) • Most destructive pests of maize and sorghum. 2011, Hodgson et al. Collect, burn or bury the remains of crops after harvest. Partial damage to stems may cause the plant to wilt. Soybean aphid, Aphis glycines Matsumura (Hemiptera: Aphididae), continues to be the most significant insect pest of soybean, Glycine max (L.) Merr., in the Upper Midwest of the United States (Hurley and Mitchell 2017).The biology, impacts, and management of soybean aphid have been well reviewed (Ragsdale et al. craccivora density increased over time in the peanut monoculture and intercropping systems before 10-Jul (F 8, 315 = 92.33, P < 0.0001), and intercropping significantly lowered aphid densities (F 1, 315 = 35.21, P < 0.0001). Aphids are often found under curled leaves, where they hide from their natural predators. This is to ensure that we give you the best experience possible. Get identification tips and learn more about the corn leaf aphid’s natural enemies, its potential impact on crop and management considerations. Management • Scraping field bunds and summer ploughings to destroy eggs, dusting cabaryl 10D or malathion 5D @ 10 kg/ac or foliar spraying with fenitrothion 2 ml/l found effective in their management. Maize dwarf mosaic virus (MDMV) is a serious maize pathogen, epidemic worldwide, and one of the most common virus diseases for monocotyledonous plants, causing up to 70% loss in corn yield globally since 1960. Corn aphid Corn aphid (Rhopalosiphum maidis) is the most common aphid species on maize and can affect any crop stage. For adults, use cracked grain baits. 2011, Hodgson et al. Use of press wheels at planting provides some control. Conserve natural enemies through reduction of broad-spectrum insecticides against other pests as the disruption of natural enemies can flare mite outbreaks. Spray monocrotophos 36 SL (or) endosulfan 35 EC 1 l /ha. Although chemical control may be cost effective, there are currently no threshold levels for GVB in maize. Rice root aphid is a cosmopolitan species (Blackman and Eastop 2000, Hesler and Kindler 2007) with North American collections dating to 1900 (Doncaster 1956). Cultivation to a dept of 100 mm destroys overwintering pupae. Bird cherry oat aphid is green with an orange saddle between the cornicles. Maize stem borer, Chilo partellus (Lepidoptera: Pyralidae) • Most destructive pests of maize and sorghum. The incidence of damage is generally too low to warrant control. Peanut aphid population in intercropping was effectively suppressed by increasing predator abundances in the early season. Abstract Aphid landing rates, species composition and abundance on lucerne (Medicago sativa), maize (Zea mays), soybean (Glycine max), wheat (Triticum aestivum) and potato (Solanum tuberosum) were determined in a small-scale field trial to identify potential crops as prospective border plants for seed potatoes to reduce the spread of Potato virus Y (PVY) in South Africa. With the disease being new to Africa, minimal effective management strategies exist against it. maize, peanuts, chickpea, lucerne) are grown in sequence. 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