408, 409, 410). So far stem borers and termites are considered as the most abundant and economically important field insect pests of maize. Eggs hatch in 3-4 days and the newly hatched larvae crawl inside the leaf whorl and feed in groups. High nitrogenous field favors population buildup of the stem borers. Damage symptoms: It infests the crop a month after sowing and upto emergence of cobs. The stems are easily pulled out (Photo 3). Maize was interplanted at the onset of the rainy season. Bore holes are visible on the stem near the nodes. Damage symptoms. Unlike other species of stem borers, the pink stem borer lay bare eggs between the leaf sheath and the stem. Symptoms are similar to those of other rice stem borers (see Fact Sheets nos. The lesser corn stalk borer causes significant crop losses in the US and Central/South America, but it is not well suited to the colder UK climate and is unlikely to cause similar levels of damage here. Central shoot withering leading to “dead heart” is the typical damage symptom. Young larva crawls and feeds on tender folded leaves causing typical “shot hole” symptom. Symptoms & Life Cycle. Maize stem borer (Chilo partellus S.) is most destructive insect pests of maize crop in Pakistan. Rose Ndemah, Fritz Schulthess, Christian Nolte, The effect of grassy field margins and fertilizer on soil water, plant nutrient levels, stem borer attacks and yield of maize in the humid forest zone of Cameroon, Annales de la Société entomologique de France (N.S. Host range – Sorghum, maize, Rice, Wheat, Sugarcane, Bajra, Ragi . ), 10.1080/00379271.2006.10697480, 42, 3-4, … Nature of Damage Adult of moth of spotted stem borer prefers 3-5 leaf stage maize for egg laying. 3. Yield losses reported due to stem borers varied greatly but the average yield losses can be estimated between 20 and 50% [15]. Maize plants that do not die as a result of larval damage are reported to produce several bushy and stunted suckers with no marketable ears. Newly hatched larvae tunnel down the plant between the leaf sheaths, killing the shoot and causing 'deadhearts'. continue to have negative impact in maize production. Fields planted later favors more damage by the insect pests that have built up in fields that have been planted earlier. Maize stalk borers are common pests throughout sub-Saharan Africa. Eggs hatch into caterpillars, which move into the growing points, ... • Apply the above products when damage symptoms are noticed Control Of Stalk Borers In Maize Crops Introduction ... Moths fly at night and lay eggs on maize plants between the leaf sheath and the stem on the youngest fully unfolded leaf. Pink larva enters into the stem causing dead heart symptom similar to that of stem borer… Abundance of adult and larval/pupal stages of maize stem borers, oviposition preference, foliar damage, borer entry/exit holes, maize plant mortality and stem breakage because of borer damage were significantly greater in the maize monocrop than in the maize-leucaena intercrops. Collect the stubbles after harvest and burn to destroy diapausing borers. Scientific name: Sesamia inferens. Eggs are generally laid on lower surface of leaves. There are three main species of stalk borers which attack maize: the African maize stalk borer (also attacks sorghum); the spotted stem borer (also attacks sorghum, bulrush millet, sugarcane and rice) and the African pink stem borer (also attacks finger millet, sugarcane and rice). Pink stem borer. Shot hole ” symptom young larva crawls and feeds on tender folded leaves causing typical “ shot hole ”.... 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