Category Archives: soybeans

Soybean stem fly on the move in soybeans in the Northern Rivers NSW

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Out­break report: Soy­bean stem fly (Melana­gromyza sojae) was detect­ed in late Jan­u­ary, 2018 in a 6-week old soy­bean crop near Casi­no, NSW. At the time of detec­tion, most stem fly in the crop were in the pupal stage. There were no plant ill health symp­toms (e.g. wilting/death), despite numer­ous exit holes made by lar­vae pri­or to pupa­tion. These holes are… Read more »

Soybean moth active again in 2017 in coastal Queensland

Major soy­bean moth out­breaks have recent­ly been report­ed in some coastal Bur­nett soy­bean crops, and less­er out­breaks in crops in the Bur­dekin. Soy­bean moth is gen­er­al­ly a minor soy­bean pest but major out­breaks have been report­ed peri­od­i­cal­ly in all soy­bean grow­ing regions. In extreme cas­es, crops can be total­ly defo­li­at­ed. Feed­ing dam­age Lar­vae feed most­ly with­in the leaves, mak­ing dis­tinc­tive… Read more »

Phytoplasma and virus problems in soybean and mungbean crops

A dev­as­tat­ing dis­ease was observed in sev­er­al pad­docks of soy­bean crops in the Branchview area of the Dar­ling Downs in late autumn 2016. Almost 100 per­cent of plants were affect­ed in some pad­docks. The affect­ed plants pro­duced no, or very few filled pods and instead had a pro­lif­er­a­tion of tiny imma­ture pods as shown in Pho­tos 1 and 2. The plants… Read more »

Don’t let lucerne crown borer overwinter in your soybean stubble

Once again, lucerne crown bor­er (LCB) (Zygri­ta diva) has been active in soy­beans this sea­son. Worst affect­ed regions were the North­ern Rivers and the Liv­er­pool Plains in NSW, but reports were also field­ed from the Bund­aberg, Fas­sifern and Dar­ling Downs regions in Queens­land. In some of the severe­ly affect­ed crops, over 80% of plants were infest­ed, and up to 70%… Read more »

Etiella in mungbeans and soybeans – do we manage the threat or the pest?

There is an under­stand­able lev­el of con­cern about how best to man­age etiel­la (Etiel­la behrii) in sum­mer mung­bean crops fol­low­ing the unex­pect­ed­ly high etiel­la infes­ta­tions (and cor­re­spond­ing seed dam­age and con­t­a­m­i­na­tion) in spring mung­bean crops on the Downs and in Cen­tral Queens­land and North West­ern New South Wales. Respond­ing to the etiel­la threat with­out react­ing pre­ma­ture­ly and cre­at­ing more pest… Read more »

Soybean moth active in North Queensland

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Sig­nif­i­cant soy­bean moth activ­i­ty has recent­ly been report­ed in some Bur­dekin soy­bean crops. Soy­bean moth is a gen­er­al­ly a minor soy­bean pest but sig­nif­i­cant out­breaks have been report­ed peri­od­i­cal­ly in all soy­bean grow­ing regions. Feed­ing dam­age Lar­vae feed most­ly with­in the leaves, mak­ing dis­tinc­tive pale leaf mines, and often dis­tort­ing leaves. Soy­bean moth is present in low num­bers in most… Read more »

Lucerne crown borer on the move in soybean in 2015

Lucerne crown bor­er (Zygri­ta diva) (LCB) is caus­ing severe dam­age in a num­ber of soy­bean crops in the Bund­aberg region of SE Qld, and on the North Coast region of NSW. In some cas­es up to 75% of plants are infest­ed and ear­ly plant death is evi­dent. Dam­age seems to be worse in the ear­ly (Novem­ber-plan­t­ed) crops which were sown… Read more »

Pod and stem boring pests of soybean – an update

The 2013/14 soy­bean grow­ing sea­son has been chal­leng­ing for many grow­ers with very low rain­fall and high tem­per­a­tures until late March. Crop stress was some­times wrong­ly attrib­uted to insect pests although a num­ber of crops were infest­ed with more unusu­al pests such as etiel­la. The high tem­per­a­tures also increased the impact of lucerne crown bor­er in infest­ed crops.

Etiella on the move again

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Back­ground: Sig­nif­i­cant etiel­la out­breaks have recent­ly been report­ed in soy­beans and mung­beans on the Dar­ling Downs, in the South Bur­nett (SE Qld) and in the Moree and North­ern­Rivers regions of NSW. In some soy­bean crops on the Downs, 100% of plants were infest­ed and 72% of axil­liary buds dam­aged to vary­ing degrees. These out­breaks are sim­i­lar but more wide­spread than… Read more »

Soybean stem fly outbreak in soybean crops

An esti­mat­ed 4,000 ha of soy­beans near Casi­no in North­ern NSW have been affect­ed to vary­ing degrees by soy­bean stem fly (Melana­gromyza sojae) , a pest rarely seen in dam­ag­ing num­bers in Aus­tralia. Dam­age in many Casi­no crops is con­found­ed by the pres­ence of char­coal rot, a dis­ease which blocks the plant’s vas­cu­lar (xylem and phloem) tis­sue and caus­es sim­i­lar… Read more »