Distribution of Larvae of Inopus rubriceps (Diptera: Stratiomyidae) Around Sugarcane Plants

Samson, Peter R.; McLennan, Paul D.

doi:10.1093/jee/85.6.2185

Cited by 3 publications

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“…Ten to 20 soil cores each 6.5 cm diameter by 25 cm deep were taken beside sugarcane plants and combined. Cores were wet-sieved and immature stages of I. rubriceps were collected on a l-mm punched-hole screen (Samson and McLennan 1992). Larvae and pupae were weighed after surface water was removed on absorbent paper.…”

Section: Introductionmentioning

confidence: 99%

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Timing of Pupation of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) in Sugarcane Fields

Samson

McLennan

1995

Australian Journal of Entomology

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Larvae of sugarcane soldier fly, Inopus rubriceps, pupated during autumn in sugarcane fields. Under conditions of moist soil and good cane growth, pupation occurred about 1 month later in northern and central Queensland than in southern Queensland and northern New South Wales, and this was related to soil temperature. The midpoint of the pupation period coincided with mean soil temperatures of 20-25 "C in each area. A laboratory experiment showed that pupation was inhibited at 25 "C and favoured by lower temperatures. The timing of pupation varied between years in one canefield in southern Queensland. Late pupation in 1991 was associated with small average size of larvae in early autumn and with dry soil conditions and poor cane growth. A high proportion of larvae failed to pupate before winter in this field in 1991. In normal years this carryover of larvae into winter was only about 10%. Male pupae were smaller than female pupae. Pupal weights were similar in each of the areas and years studied, but in some fields pupal weights declined with time during the pupation period.

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Section: Introductionmentioning

confidence: 99%

“…Soil temperature and moisture were recorded hourly beside one cane plant near the centre of each area during the study period. Duplicate sensors were buried at 10 cm depth, representing the zone commonly inhabited by larvae of I. rubriceps (Samson and McLennan 1992). Daily means were caiculated from the 24 hourly records.…”

Section: Introductionmentioning

confidence: 99%

Timing of Pupation of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) in Sugarcane Fields

Samson

McLennan

1995

Australian Journal of Entomology

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“…This may delay build up of larvae in subsequent ratoon crops by reducing the initial breeding population. This strategy is presently being tested.Larvae of I. rvbriceps are aggregated along rows of established sugarcane (Robertson 1984;Samson and McLennan 1992) so insecticides should be applied most efficiently along the rows. However, larvae are presumably dispersed throughout fields when cane is first planted after fallowing and soil cultivation.…”

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Movement of Larvae of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) Into Rows of Sugarcane

Samson

Harris

1995

Australian Journal of Entomology

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Larvae of sugarcane soldiei-fly, liiopirs rrrbriceps, began aggregating near sugarcane plants in trough5 within 1 week of planting. By 6 weeks. almost 80% of larvae were found within 13 cm of the plants and only 5mo \veIe found 25-50 crn distant.Sugarcane soldier fly. Inopus rubriceps (Macquart), is a pest of sugarcane in Australia (Hitchcock 1970). The soil-dwelling larvae feed on sugarcane roots, causing poor growth and failure of ratooning aftzr harvest. Damage is usually seen in crops that are older than second ratoon (Samson et ul. 1991). However, larvae are often present in low numbers in newly-planted crops that follow ploughout of infested sugarcane (unpublished data).A number of insecticides were effective against larvae of I . rvbriceps in bioassays (Samson 1992). One strategy of insecticide use is to apply insecticides in the plant crop, to reduce numbers of larvae carried over from the previous cropping cycle. This may delay build up of larvae in subsequent ratoon crops by reducing the initial breeding population. This strategy is presently being tested.Larvae of I. rvbriceps are aggregated along rows of established sugarcane (Robertson 1984;Samson and McLennan 1992) so insecticides should be applied most efficiently along the rows. However, larvae are presumably dispersed throughout fields when cane is first planted after fallowing and soil cultivation. We did not know how long it would take larvae to concentrate on the newly-plantedrows. An estimate of this time is necessary to determine the best time of insecticide application. Application soon after planting is desirable, as the planting drill is then fully open and plants will not have begun stooling out. However, insecticide applied too early may be lost before larvae are attracted to the rows.Densities of larvae in newly planted sugarcane fields are too low to measure larval attraction to rows. Therefore, we obtained the necessary information using larvae and sugarcane plants in troughs. The troughs measured 1 r n long x 20 cm wide x 15 cm deep, the length being chosen to approximate the commercial sugarcane row width of 1.4-1.5 m. Larvae were collected from sugarcane fields in November. Eighteen troughs were filled with red volcanic soil (krasnozem) and 60 larvae were added evenly along the length of each trough. Four cuttings (setts) of cane stalk, each containing a single bud, were planted beside the midline of each trough 1 week later. Soil was subsequently removed from the trough in eight segments of equal size (Fig. 1). Pairs of segments 1 50 38 25 13 o 1 3 25 38 50Distance from midline (cm) Fig. 1. Sampling desigi of troughs used to measure aggregation of larvae of lt7opus rubriceps. Soil was sampled in eight segments and the segments combiiied as indicated by similar shading; the central black box represents the position of the sugarcane setts.equidistant from the midline were combined and larvae extracted by wet-sieving. Three troughs were sampled at each of six times up to 6 weeks after planting. The first sampling at 0 weeks was carr...

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Effectiveness of some controlled-release insecticides against larvae of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae), a pest of Australian sugarcane

Samson

Harris

1997

Crop Protection

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Distribution of Larvae of Inopus rubriceps (Diptera: Stratiomyidae) Around Sugarcane Plants

Cited by 3 publications

References 0 publications

Timing of Pupation of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) in Sugarcane Fields

Timing of Pupation of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) in Sugarcane Fields

Movement of Larvae of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae) Into Rows of Sugarcane

Effectiveness of some controlled-release insecticides against larvae of Inopus rubriceps (Macquart) (Diptera: Stratiomyidae), a pest of Australian sugarcane

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