Monitor crops after sowing until establishment. For adults, use cracked grain baits. Cutworms may be found in any soil type and often move into the crop from adjoining fence lines, pastures or weedy fallows. Cutworms are attacked by a range of natural enemies such as parasitoids, predators and diseases. Two-spotted mite is a widespread but irregular pest of maize during seed fill to maturity. The only way to control these pests is fumigation. For larvae, use seed treatments or in-furrow sprays. Caterpillars hatching prior to silking cause little damage to tassels but may cause damage when migrating to cobs. April 4, 2018. Armyworm larvae are attacked by a number of parasitoids that may assist in reducing the intensity of outbreaks, although are unlikely to give timely control if armyworm numbers are high. From the last experiment, we found out that physical disturbance resulted in 81% weevil mortality. Weed is one of the pests that reduce the yield of a maize farm. Both are able to develop on a wide range of cereals and also on processed cereal products. Chapter 4: Effect of Storage Container Physical Disturbance on Maize Weevil Mortality. Monitor crops after planting until establishment. Since it is an internal pest, residual control will only kill; Exposed adults. Adults and nymphs feed by piercing and sucking on developing cobs, causing deformities, similar to green vegetable bug damage. Both insects are less coldhardy than the Grain weevil and will not normally overwinter in unheated premises or grain stored at normal temperatures. These weevils are a major pest of perennial ryegrass (Lolium perenne) in developed pastures, maize and cereal crops. The Maize Weevil is about 2.5 - 4 mm long. Both adults and larvaefeed on internally on maize grains and an infestation can start in the field (when the cob is still on the plant) but most damage occurs in storage. Cultivation to a dept of 100 mm destroys overwintering pupae. Larvae from eggs laid on silks or husks may cause significant damage. Attacks from Attacks from Sitophillus oryzae can start in the field, when the moisture content is about 20% (although Sitophilus zeamais is the The rice weevil is a small snout beetle which varies in size, but it averages about three thirty-seconds inch in length. The maize weevil breeds on maize in the field but the Rice weevil only breeds in stored grain. Sitophilus zeamais (maize weevil) is a field and storage pest of maize of economic importance in several parts of Africa. Damage is often patchy, and there are no effective controls, although a. Metarhiziumfungus and entomopathogenic nematodes have been reported to occasionally cause high larval mortality. Assessment of infestations A variety of trapping techniques are available for measuring stored product beetle infestations. 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These powders caused high mortality rates on the immature stages of the pests and repelled the adult weevils. Inspect emerging seedlings twice per week. Table 1. Yield loss may occur on water stressed plants. Stored grain insect infestations rarely begin in the field. Treat seedlings when there is a rapidly increasing area of infestation or proportion of crop damage (>10% seedling loss). sanitary, cultural, botanical, biological and chemical control measures to manage weevil. Mass emergence of adults occurs after rain in November-January, and damage is often worse when two host crops (e.g. Adults and nymphs feed by piercing and sucking on developing cobs, and may severely deform cobs. The maize weevil (Sitophilus zeamais), known in the United States as the greater rice weevil, is a species of beetle in the family Curculionidae.It can be found in numerous tropical areas around the world, and in the United States, and is a major pest of maize. Note that helicoverpa larvae may be confused with armyworms or cutworms. Previous studies had confirmed effectiveness of ground powder derived from these plants in control of maize weevil in western Kenya (Ogendo et al., 2004a, Ogendo et al., 2004b). University of KwaZulu-Natal doctoral candidate, Mohamed Saeed, describes his successful tests with a widely known fungus to help achieve this. October 25, 2017 at 1:02 pm Protecting stored grain from insect pests is essential for Africa’s future food security. The Maize weevil will breed on maize in the field, but the Rice weevil only breeds in stored grain. The use of phytochemicals for controlling storage pests constitutes an attractive alternative to synthetic products, since plant may be more biodegradable and safer. Resembles rice weevil, only bigger and the red-brown spots on wing covers are more clearly marked. The head has a long slender snout. along field edges) may be successful. Fine webbing on the lower leaf surface indicates their presence, and heavy infestations will result in leaf desiccation, leaf drop and yield loss. Yellow peach moth is a minor and irregular pest of maize in Queensland. The Australian Plague Locust Commission provides details of hopper migrations. The predominant control of this pest is the use of synthetic residual pesticides, which have adverse effects on consumers and environment. Locusts are sporadic and potentially major pests of maize. High numbers can cause plants to turn yellow and appear unthrifty. Detailed information about the use of cookies on this website and how you can manage or withdraw your consent at any time can be found in our Pm Protecting stored grain include pit fall traps, bait bags, insect traps. At the tunnel entrance yellowing on the immature stages of the pests that the., wheat highest risk period is during summer and spring shoots in spring, resulting in patchy stands thus the! 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