WEED MANAGEMENT IN MAIZE. Helicoverpa are usually not considered economical to control, except in high value seed maize. Host range – Sorghum, Maize, Rice, Millets. The main pests of maize are helicoverpa and a number of soil insects. Home-made preparations are ideal for small numbers of plants, but commercial products are probably the only practical solution when crop areas are large. • Its caterpillar damage maize and sorghum by boring into the stems, cobs or ear. Seed treatments help deter feeding. True wireworm larvae may also feed on helicoverpa pupae. False wireworm larvae attack germinating seeds and seedling roots and shoots in spring, resulting in patchy stands. NATURAL ENEMIESAphid populations are controlled by environmental factors, several parasitic wasps, fungal diseases, ladybird beetles, syrphid fly larvae, and lacewing larvae and adults. Damage is worse when crop growth is retarded by dry, wet or cool conditions. Signs of damage include chewed leaf margins and faecal pellets at the base of young plants or in the throats of older plants. Aphids suck the sap of plants, often occurring in large numbers, causing plants to yellow and wilt. Other species of Aphelinus have been used elsewhere with equally beneficial results, as well as the braconids, Lysiphlebus species. Maize aphid Rhopalosiphum maidis Corn leaf aphid, Green corn aphid Share . In some countries, losses of more than 60% are reported on maize. The two hybrids of Bt maize expressing Cry1Ab had no negative effects on the measured biological parameters of the aphid R. maidis or its predator, the ladybeetle P. japonica . Last updated: Heavily infected seedlings rarely grow taller than 25 cm. Three species of aphids commonly are found on grain and forage sorghums in Missouri. Plant-derived products, such as neem, derris, pyrethrum and chilli (with the addition of soap). Rice root aphid is a cosmopolitan species (Blackman and Eastop 2000, Hesler and Kindler 2007) with North American collections dating to 1900 (Doncaster 1956). Neil Groom, technical director for maize seed supplier Grainseed looks at the eight biggest threats to the UK crop. Large numbers of aphids occur on maize "tassels" (the male flowers) preventing the development of pollen (Photo 1). the country, and it is predicted that, by 2050, the demand for maize in the developing world will double. Scientific name: Rhopalosiphum maidis. The main pests of maize are helicoverpa and a number of soil insects. Consider the nonchemical controls discussed below, as most insecticides will destroy beneficial insects along with the pest. 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 … Scientific name: Peregrinus maidis. It has been shown that infestations of black bean aphid in common beans were greatly reduced when intercropped with older and taller maize plants in a study in Kenya (Ogenga-Latigo et al., 1993). Shallow planting in warm moist soil will encourage rapid crop emergence and growth, thus reducing the impact of insects. Yellow peach moth is a minor and irregular pest of maize in Queensland. NATURAL ENEMIES Aphid populations are controlled by environmental factors, several parasitic wasps, fungal diseases, ladybird beetles, syrphid fly larvae, and lacewing larvae and adults. ... Corn aphid is the most common aphid species on maize and can affect any crop stage. • Its caterpillar damage maize and sorghum by boring into the stems, cobs or ear. Maize leafhoppers and maize thrips are widespread but irregular in Queensland, and can rapidly reops‐infest cr after spraying meaning more than one spray may be required. along field edges) may be successful. Pests, weeds and disease in maize crops can severely reduce yield and quality. Corn Insect Control Recommendations: E-series 219-W (PDF) Prior to Tasseling - Corn leaf aphid control is most effective 2 to 3 weeks … Dig and sieve soil to detect adults and nymphs prior to planting. Although the e cacy of M. anisopliae ICIPE 62-based biopesticide could be a ected by seasons, it successfully controlled aphid population in cowpea–maize intercrop under ﬁeld conditions without a ecting aphid … This is to ensure that we give you the best experience possible. Corn aphid Corn aphid (Rhopalosiphum maidis) is the most common aphid species on maize and can affect any crop stage. Overall, maize had the highest mean number of nymphs and apterous adults (530.7) recorded on leaves, followed by wheat (56.4), potato (15.9), and lucerne (8.8). Schröder & K. Krüger* Department of Zoology and Entomology, University of Pretoria, … It is grown for fodder as well as for grain. 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