A survey of apple leafcurling midge (&lt;i&gt;Dasyneura mali) &lt;/i&gt;in the Nelson district

Self Cite

During the 1995-96 and 1996-97 growing seasons, regular monitoring of apple leafcurling midge (ALM) (Dasineura mali Diptera: Cecidomyiidae) egg laying was conducted in three conventionallymanaged orchard properties on the Waimea Plains, Nelson. The percentage of apple shoots infested with ALM eggs fluctuated considerably between seasons. The timing of egg laying peaks was similar between orchard properties, but differed between cultivars. Peak egg laying periods occurred 7-14 days earlier on 'Royal Gala' compared with 'Braeburn'. No notable difference in the level of apple shoot tips infested with ALM eggs occurred between cultivars. Similarly, no orchard property had consistently higher or lower levels of shoot tips infested with ALM eggs during the season. The importance of these findings for monitoring ALM is discussed briefly.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Apple leafcurling midge egg laying on different apple cultivars and orchard properties on the Waimea plains, Nelson

Smith¹,

Chapman²

1997

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“…Diazinon is a broad spectrum organophosphate insecticide which is commonly used on New Zealand apple orchards specifically for the control of apple leafcurling midge (ALM) (Dasineura mali Diptera: Cecidomyiidae) (Smith and Chapman 1995;Tomkins et al 1994). It is often applied as a foliar spray, although many orchardists make soil applications during late winter or early spring in an attempt to control overwintering ALM pupae or emerging adults.…”

Section: Introductionmentioning

confidence: 99%

Soil degradation of diazinon and its effect on the emergence of apple leafcurling midge

Smith¹,

Chapman²,

Frampton³

1998

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The degradation of diazinon residues in the soil of an orchard on the Waimea Plains, Nelson was determined. The half life of diazinon varied significantly between 12.2 and 27.7 days, depending on the time of application. Soil applications of diazinon had a significant effect on the emergence of adult apple leafcurling midge (ALM) (Dasineura mali Diptera: Cecidomyiidae). More ALM were captured in the control and plots treated with diazinon on 7 September than in plots treated with diazinon on 21 September and 5 October.

“…Apple leafcurling midge (Dasyneura mali Kieffer) (ALM) is now a serious pest of apples in most regions of New Zealand. Recent surveys of orchards in the Waikato (Tomkins et al 1994) and Nelson (Smith and Chapman 1995a) districts have shown that many trees in these areas have had greater than 50% of their shoots damaged by ALM. The concern shown by growers and the apple industry as a whole towards ALM also clearly reflects the importance of this insect (Anonymous 1994;June 1994;Smith and Chapman 1995a).…”

Section: Introductionmentioning

confidence: 99%

Comparison between emergence and egg laying in applecurling midge (<i>Dasyneura mali</i>)

Smith¹,

Chapman²

1996

Self Cite

Two trap designs were placed in three orchards on the Waimea Plains, Nelson, during October 1995 and April 1996, to evaluate their potential to monitor soil emergence of adult apple leafcurling midge (ALM) (Dasyneura mali Diptera:Cecidomyiidae). No correlation between the percentage of apple shoots infested with ALM eggs compared to the number of ALM adults caught in emergence traps was shown. A significantly greater number of ALM were captured on one orchard with 2.2 ALM per ten traps per week compared to 0.5 for each of the other orchards. The apple cultivars 'Royal Gala' and 'Braeburn' showed no significant difference in the number of adult ALM captured or egg infestation levels. The implications of these findings for future monitoring and study of ALM is discussed briefly.