Impact of insecticides on silverleaf whitefly parasitoid

The tiny wasp Eretmo­cerus hay­ati is an impor­tant nat­ur­al ene­my of sil­ver­leaf white­fly (SLW) and con­tributes to the nat­ur­al bio­log­i­cal con­trol of this pest through­out the sea­son. It occurs in almost all regions that grow cot­ton, but due to its small size (dif­fi­cult to see with­out a hand lens) it often goes unno­ticed. Like all nat­ur­al ene­mies, Eretmo­cerus is sus­cep­ti­ble… Read more »

Identifying insect pests in stored grain

Winter—time to vis­it your stor­ages As tem­per­a­tures drop and hope­ful­ly win­ter crop plant­i­ng is com­plet­ed, a lit­tle time invest­ed around your stor­age facil­i­ty will pay div­i­dends. Dur­ing our cold­est months stor­age pests are not breed­ing rapid­ly and are less like­ly to fly. They are qui­et­ly sit­ting in grain residues in emp­ty silos, or keep­ing warm in silos still hold­ing grain.… Read more »

Whitefly in establishing grain crops

This sum­mer sil­ver­leaf white­fly (SLW) pop­u­la­tions have been extreme­ly high in many cot­ton crops, par­tic­u­lar­ly in NSW. As these crops are defo­li­at­ed, large num­bers of SLW are mov­ing out of the cot­ton into sur­round­ing veg­e­ta­tion, includ­ing emerg­ing grain crops. Whilst the num­ber of SLW adults land­ing in seedling canola, wheat, faba beans and cere­als can look dra­mat­ic, pre­vi­ous expe­ri­ence has… Read more »

Being prepared for Russian wheat aphid in the Northern grains region

The spread of Russ­ian wheat aphid (RWA) (Diu­raphis nox­ia) in the North­ern grains region is con­sid­ered inevitable. When it might be detect­ed in wheat and bar­ley is less clear as the key dri­vers of its spread are not well under­stood in Aus­tralia. Wind is like­ly to play a part in mov­ing winged aphids from south to north. The most norther­ly… 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 resurfaces in the summer of 2016/17

Phy­to­plas­ma (a spe­cialised bac­te­ria infect­ing plants) has been wide­ly report­ed in spring-plan­t­ed mung­beans from Cen­tral Queens­land to North West­ern NSW (Moree and Narrabri) and all areas in between. Symp­toms include mass­es of small deformed leaves, flow­ers and pods, plants remain­ing green at har­vest, and pos­si­bly an increased inci­dence of puffy pod. While in pre­vi­ous recent sum­mers, mod­er­ate to high lev­els… Read more »

Making decisions about Rutherglen bug in maturing sorghum crops

Ruther­glen bug (RGB) num­bers are per­sist­ing in many sorghum crops as they start to reach phys­i­o­log­i­cal matu­ri­ty. Queens­land Depart­ment of Agri­cul­ture and Fish­eries (DAF) research has shown no evi­dence of yield loss as a result of direct feed­ing on grain once it reach­es phys­i­o­log­i­cal matu­ri­ty (black lay­er). How­ev­er, because most crops this year have stag­gered head emer­gence, there are a… Read more »

Considerations when using pyriproxyfen on silverleaf whitefly

With the cur­rent sea­son shap­ing up to be one of high insect pres­sure, we may see sil­ver­leaf white­fly (SLW), Bemisia tabaci reach prob­lem­at­ic lev­els in regions out­side of their tra­di­tion­al range. For grow­ers and agron­o­mists not famil­iar with their con­trol it is worth invest­ing some time to under­stand how one of the main reg­is­tered insec­ti­cides, pyriprox­yfen, works. What is pyriprox­yfen?… Read more »

A new pigeon pea variety for Bollgard 3 refuges

image of flowering pigeon pea suitable for cotton refuges

Pigeon peas rep­re­sent about 80% of the refuges cul­ti­vat­ed to off­set Boll­gard cot­ton in Aus­tralia due to the land area use effi­cien­cy of this option. How­ev­er, over the years, vari­etal mix­ing and con­tin­u­al recy­cling of seed from undam­aged refuges has result­ed in peas that flower lat­er in the sea­son, increas­ing­ly lack­ing syn­chrony with Bollgard’s boll set­ting peri­od, thus reduc­ing the… Read more »

I think I may have solenopsis mealybug in my cotton – what do I do?

Solenop­sis mealy­bug can be found through­out Queensland’s crop­ping areas and has also been con­firmed in West­ern Aus­tralia, the North­ern Ter­ri­to­ry and Vic­to­ria. Whilst solenop­sis has not yet been con­firmed in NSW cot­ton crops it would be rea­son­able to assume that it is like­ly to be present in the broad­er land­scape and it is only a mat­ter of time before it… Read more »