Insect Control in Stored Grain - Department of Primary Industries
Insect Control in Stored Grain - Department of Primary Industries
Insect Control in Stored Grain - Department of Primary Industries
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Table 4: Dichlorvos application rates for knockdown <strong>of</strong> live adult <strong>in</strong>sects <strong>in</strong> <strong>in</strong>fested<br />
cereal gra<strong>in</strong>. If gra<strong>in</strong> is to be sold, use <strong>in</strong>secticides only if approved by your buyer or handler. Cereal<br />
gra<strong>in</strong>s <strong>in</strong>clude: barley, maize, millets, oats, rice, sorghum, triticale, wheat.<br />
<strong>Insect</strong>s <strong>Insect</strong>icide<br />
(For Trade<br />
names –<br />
see Table<br />
9)<br />
most species dichlorvos<br />
1.14 kg/L<br />
lesser gra<strong>in</strong><br />
borer<br />
500 g/L<br />
dichlorvos<br />
1.14 kg/L<br />
moths only dichlorvos<br />
1.14 kg/L<br />
500 g/L<br />
Dilution<br />
rate 1<br />
5.3 mL<br />
12 mL<br />
10.5 mL<br />
4.4 mL<br />
10 mL<br />
Application rate Cost 2 Withhold<strong>in</strong>g period 3<br />
Apply 1 L <strong>of</strong> diluted<br />
<strong>in</strong>secticide per tonne<br />
as gra<strong>in</strong> is augured<br />
Apply 1 L <strong>of</strong> diluted<br />
<strong>in</strong>secticide per tonne<br />
as gra<strong>in</strong> is augured<br />
Apply 1 L <strong>of</strong> diluted<br />
<strong>in</strong>secticide for every<br />
20m 2 <strong>of</strong> gra<strong>in</strong> surface<br />
area<br />
12-15c<br />
30-35c<br />
24-30c<br />
10-15c<br />
24-30c<br />
7 days<br />
7 days<br />
28 days<br />
7 days<br />
7 days<br />
Notes table 4:<br />
ALWAYS CHECK LABELS<br />
For <strong>in</strong>secticide trade names, see Table 9.<br />
1. Dilute liquid concentrates <strong>in</strong> water at the specified rate per litre, then spray 1 litre <strong>of</strong> the mixture per<br />
tonne <strong>of</strong> gra<strong>in</strong> while augur<strong>in</strong>g the gra<strong>in</strong> or spray 1 litre per 20 square metres <strong>of</strong> gra<strong>in</strong> surface to control<br />
moths.<br />
2. Costs (cents per tonne or cents per 20 square metres <strong>in</strong> 2006) for chemicals only are presented as<br />
an approximate guide.<br />
3. If gra<strong>in</strong> is <strong>in</strong>fested with lesser gra<strong>in</strong> borers then the 10.5ml rate <strong>of</strong> dichlorvos is recommended<br />
because <strong>of</strong> resistance <strong>in</strong> these <strong>in</strong>sects. A withhold<strong>in</strong>g period <strong>of</strong> 28 days applies to this treatment.<br />
Residual <strong>Insect</strong>icides (Protectants) for Treat<strong>in</strong>g <strong>Stored</strong> Gra<strong>in</strong>s<br />
There are three treatment tables here which cover the follow<strong>in</strong>g on-farm treatment requirements:<br />
• Treat<strong>in</strong>g stored cereal gra<strong>in</strong> (except malt<strong>in</strong>g barley) Table 5<br />
• Treat<strong>in</strong>g stored feed gra<strong>in</strong>s and/or seed Table 6<br />
• Treat<strong>in</strong>g stored malt<strong>in</strong>g barley on-farm Table 7<br />
IMPORTANT NOTES on Protectant <strong>Insect</strong>icides:<br />
• Protectants (<strong>in</strong>secticides sprayed directly on to gra<strong>in</strong> at <strong>in</strong>-load<strong>in</strong>g) will not always kill adult <strong>in</strong>sects<br />
present at the time <strong>of</strong> treatment.These treatments are <strong>in</strong>tended to control develop<strong>in</strong>g immature<br />
<strong>in</strong>sect stages (ie, larvae), rather than exist<strong>in</strong>g mature adult stages.<br />
• Methoprene and s-methoprene (IGR ®) , are ‘<strong>in</strong>sect growth regulators’ - they control only immature<br />
stages and will not kill adult <strong>in</strong>sects.<br />
• Phosph<strong>in</strong>e or dichlorvos are recommended for use as a knock-down treatment if adult <strong>in</strong>sects are<br />
present.<br />
• If protectants are to be added to <strong>in</strong>fested gra<strong>in</strong> then the gra<strong>in</strong> should be treated (fumigated) with<br />
phosph<strong>in</strong>e before apply<strong>in</strong>g the protectants, or, alternatively, dichlorvos (Table 4) can be applied as a<br />
direct spray to gra<strong>in</strong> at the same time as the protectants.<br />
• Adhere strictly to label rates so the Maximum Residue Limits (MRL’s) are not exceeded when your<br />
gra<strong>in</strong> is sold to end-user.<br />
7