Proper Pesticide Applications in Greenhouses: EQUIPMENT


My name is Dan Egel I’m a vegetable plant pathologist with Purdue University I’m located at the southwest Purdue AG center here in Vincennes Indiana first thing I’d like to talk about is the types of equipment that one might use to apply pesticides to tomatoes in a greenhouse like you see in back of me Certainly this would be true for other commodities other vegetable crops So the first piece of equipment, I want to talk about today is what I call a garden sprayer It’s easily found at a hardware store or a garden center for example it has usually a two gallon one or two gallon tank It can Be easily pumped up like this to apply pressure so that it can be sprayed Usually you’ll find it with a wand type sprayer like this sometimes this brass is in this case where or a plastic, and the nozzle is easily adjustable from a stream to a sprayer. The advantages of the Of this type of sprayer this garden sprayer is its it’s easy to find It’s cheap, and it’s easy to use However there are several disadvantages as well one of the disadvantages of using a garden sprayer like this to apply pesticides is the the rate of the the volume of the the liquid that comes out of here will depend on whether the nozzle is in the spray position or whether it’s in the stream position and since the nozzle can be bumped easily Than then that means that the output of the pesticide is going to be different and since the label will specify usually on a per acre basis then then this is going to be a problem. We’re going to plump it up And then I’m going to measure the volume of the application in a graduated cylinder We’re going to measure the volume for 20 seconds I don’t know if you can tell, but this is in in the spray position We have about 85 Milliliters or cubic centimeters of water now. I’m going to start over I’m going to pump it up the same number of times And I don’t know if you can tell there, but it’s coming out in a stream. Now you probably would not apply this as a stream to your tomatoes for example However, it might be easy to bump this so so it changed from a stream and into something different And there we have about 210 mils and It’s pretty easy to see that you get different amounts of liquid out of this garden sprayer depending on whether it’s a stream or a spray. Another disadvantage of using a garden sprayer to apply pesticides is that as pressure decreases the volume decreases and so that will make the application of the pesticide inaccurate. We’re in the spray position we’re applying it this is five pumps and so we’re going to see how much volume comes out in 20 seconds, and then I’ll compare it I’ll plump it up again to 15 times and try it again. I’m going to pump it up 15 times Now I’m going to do it again for 20 seconds So this has been pumped up 15 times And we’re going to see it how much volume there is compared to when I only pumped it up five times Okay, we can see here. We’ve got about 80 mils Here with about sixty mils here, so the more pressure When we pumped it up 15 times we got more volume out of the garden sprayer Than when we pump that up five times so as I’m moving along and spraying with with the sprayer The pressure is going to decrease and the volume coming out was going to decrease so it’d be very difficult to apply pesticides Accurately with the garden sprayer for that reason. As an alternative to using a garden sprayer what I’d like to talk about now is the use of a backpack sprayer to apply pesticides Like for example to the greenhouse in back of me So this this backpack sprayer has come for four to five for example gallon capacity This one came with a a wand application I’ve purchased a boom because I think it’ll be easier to apply as we’ll see a little bit later Notable here is we have a pump that when it’s worn on my back can be applied constantly and this will keep the pressure constant That means that that overcomes a disadvantage that we talked about with the garden sprayer where the pressure will go down over time because we can keep pumping it as we spray you’ll also notice that we have a Pressure gauge here and by by pumping it constantly we can look at the pressure here to notice whether that pressure is staying constant or not Another thing that I like about a backpack sprayer is is the nozzles here These are interchangeable b ut these are made they’re designed for the application of pesticides Whereas the the adjustable nozzles that we saw with backpack sprayer really is not designed for pesticide application this will remain constant through the entire application process

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