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IPM and Natural Enemies

Conservation of natural enemies

Impact of soybean pesticides on natural enemies

Scouting soybean aphid and it's natural enemies

 

  

Effects of Reduced Risk-Insecticides on the Soybean Natural Enemy Community Material and Methods

In 2005, five insecticide treatments and a control were replicated six times using NK S24-K4 RR soybeans. Soybeans were planted in plots measuring 4.6 m by 27.4 m on 22 May, 2005. Weed control was attained by two applications of Roundup Weather Max. All foliar insecticides were applied on 2 August, 2005, using a backpack sprayer and hand boom. Rates for seed and foliar applied insecticides can be found in Table 1.

Soybean aphids were sampled once every week starting at the beginning of July and ending at the end of August. Soybean exposure to soybean aphids (cumulative aphid days) was calculated after foliar insecticides were applied.

 

Table 1. Insecticides and rates tested

Product Name Class Formulation Active ingredient Application Rate
Untreated N/A N/A N/A N/A N/A
Lorsban Organophosphate 4 E chlorpyrifos foliar 16 fl oz/ac
Lorsban + Baythroid Organophosphate+ Pyrethroid Tank mix chlorpyrifos+ cyfluthrin foliar 4 fl oz + 2 fl oz/ac
Pro Axis Pyrethroid 0.5 E gamma-cyhalothrin foliar 3.2 fl oz/ac
Decis Pyrethroid 1.5 E deltamethrin foliar 1.9 fl oz/ac
Warrior Pyrethroid 1 SC lambda-cyhalothrin foliar 3.2 fl oz/ac
Baythroid Pyrethroid 2 E cyfluthrin foliar 2.8 fl oz/ac
Fulfill* Pymetrazione 50 WG pymetrazione foliar 2.3 oz/ac
Cruiser Nicotinoid 5 FS thiamethoxam seed treatment 50 g/100 kg
Cruiser Nicotinoid 5 FS thiamethoxam seed treatment 100 g/100 kg*
Trimax* Nicotinoid 4 E imidacloprid foliar 1.5 oz/ac
Gaucho Nicotinoid 480 F imidacloprid seed treatment 65 g/100 kg
* Not labeled for use in soybeans


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This website is supported by a grant from the North Central Soybean Research Program and is compiled and hosted by the Department of Entomology, University of Wisconsin – Madison .

Last update 10/11/06