Agrochemical Updates, eBulletin

Bacillus thuringiensis provides a late-season fall armyworm control option

The eBulletin issued on 6 November 2020 listed products under permit for control of fall armyworm (Spodoptera frugiperda). Table 1 has now been updated to include insecticides registered for use in vineyards that contain the bacterium Bacillus thuringiensis (Bt) subspecies aizawai or kurstaki. The Bt products listed in Table 1 have armyworm (Spodoptera spp.) on the label and would most likely kill larvae of fall armyworm, especially if applied when larvae are small. The Bt products may be used until harvest.

The efficacy of the different Bt strains against fall armyworm depends on the type of toxins the strains produce. Research indicates that the aizawai strain provides better control of fall armyworm than the kurstaki strain.

Fall armyworm has a reputation for developing resistance to insecticides. If fall armyworm is found in the vineyard, a program of control that uses several activity groups over the control period is needed. Resistance management strategies will be required to maintain effectiveness of insecticides for controlling this pest.

For more information please contact Marcel Essling on 08 8313 6600 or email

Table 1. Chemical control options for fall armyworm in wine-grape production.

Fall armyworm
Active constituent Activity group Some registered products Restriction on use for export wine Permit number


Electra 225, KDpc Metho, Landrin 225, Lannate L, Lymo 225, Methomyl (225, 225 SL), Nudrin 225, Pirate, Seneca (Ultra 400SP), Sinmas 225 Not recommended on grapes destined for export wine. Contact your winery prior to any methomyl application. 89293


Altacor Hort Use no later than E-L 25, 80% capfall. 89259


Delegate Use no later than E-L 31, berries pea-size (not > 7 mm diameter). 89241


Entrust Organic 89870


Energise, Proclaim, Proclaim Opti, Warlock Use no later than E-L 31, berries pea-size (not > 7 mm diameter) AND do not use within 56 days of harvest. 89263


Avatar, Incarnate 300 WG, Indoxacarb 300WG, Lepta 300 WG, Persona 300 WG, Spymaster 300WG 89278
Bacillus thuringiensis aizawai 11 Bacchus WG May be used until harvest
Bacillus thuringiensis kurstaki 11 Delfin, DiPel DF

This information is provided to inform the Australian grape and wine sector and should not be interpreted as an endorsement of any product.


Hardke, J.T., Rogers Leonard, B., Huanga, F., Jackson, R.E. 2011. Damage and survivorship of fall armyworm (Lepidoptera: Noctuidae) on transgenic field corn expressing Bacillus thuringiensis Cry proteins. Crop Prot. 30(2): 168-172.

Hercos Valicente, F., Augustode, E., Picoli, T., Vilaçade Vasconcelos, M. J., Portilho Carneiro, N., Almeida Carneiro, A., Teixeira Guimarães, C., Lana, U.G. 2010. Molecular characterization and distribution of Bacillus thuringiensis cry1 genes from Brazilian strains effective against the fall armyworm, Spodoptera frugiperda. Biol. Control 53 (3): 360-366.

Wang, Y., Wang, J., Fu, X., Nageotte, J.R., Silverman, J., Bretsnyder, E.C., Chen, D., Rydel, T.J., Bean, G.J., Li, K.S., Kraft, E., Gowda, A., Nance, A., Moore, R.G., Pleau, M.J., Milligan, J.S., Anderson, H.M., Asiimwe, P., Evans, A., Moar, W.J., Martinelli, S., Head, G.P., Haas, J.A., Baum, J.A., Yang, F., Kerns, D.L., Jerga, A. 2019. Bacillus thuringiensis Cry1Da_7 and Cry1B.868 protein interactions with novel receptors allow control of resistant fall armyworms, Spodoptera frugiperda (J.E. Smith). Appl. Environ. Microbiol. 85(16): 1-15.