Yearly Archives: 2016

While not a common pest in Soybeans on the Darling Downs, the Legume Webspinner (Lamprosema abstitalis) is intermittently present in Soybean growing areas and is capable of impacting yield through defoliation. Treatment thresholds are based on the prevalence of defoliation and the crop's growing stage. If the crop has not yet begun to flower 33-40% of leaves must be defoliated to reach threshold while during early pod fill the threshold is lower at 15-20%.

The video above was shot out in the field near Norwin in March 2016. I apologise for the vibration and noise. Next time, I will turn the ute off before taking the video. Initially I found large numbers of the Legume Webspinner but on subsequent checks their numbers reduced dramatically. Only minor levels of defoliation occurred while pod fill was occurring so I do not believe they impacted yield. There were only minor levels during this time of other pests such as Helicoverpa and Loopers.

People might find the following links useful in regard to Legume Webspinner:

DAF - Legume webspinner or bean leafroller

GRDC - Legume Webspinner (North)

Soybeans growing guide for Queensland

IPM Guidelines - northern region

Written by

Robert Boulton

 

Cotton Harlequin Bug

The Cotton Harlequin Bug (also known as Hibiscus Harlequin Bugs), part of the Jewel Bug family, can be a fairly common sight in the cotton and are considered a minor pest, though we rarely treat for them. Their feeding can allow the introduction of disease into the cotton boll where boll rot can occur. They…
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Top 4 Cotton Defoliation Application Tips for Growers

It is that time of the year again when the Cotton is rapidly maturing and approaching defoliation. I won’t get into defoliant rates or how to tell when to defoliate as there is plenty of literature out there describing how to achieve this including the CSD’s facts on Friday series.  My main focus in this…
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Cotton Aphids: A closer look

Black Earth recently acquired a Mobile phone microscope x60 to assist in identification of pests and we have not been disappointed with the results. The photos of Cotton Aphids in this article where taken using the scope and an iPhone 6 while still in the field. There is some difficulty in steadying the phone long enough…
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