b'the diagnosis, get in touch with somebody that can help. This is a critical step to avoid misdiagnosis. Call your agronomist, or extension personnel, or whoever might be available to help you out that has expertise in herbicide injury. SS: What are the different types of herbicide injury?AR: For the growth regulators or group 4s, youre going to see what we often refer to as epinasty, and that is kind of this twisting, curling, bubbling, wrinkling of the stems, leafs, leaflets. Sometimes you may see parallel venation in the leaflets where the veins instead of going away from that mid rib vein, kind of more almost line up with the mid rib vein. What happens to the tubers? For 2,4-D injury you may see increased tuber set,Potato plants that were affected by carryover from seed that was accidentally treated with a smaller tubers, and deeper eyes. TheseGroup 4 herbicide.PHOTO: VIKRAM BISHTsymptoms can be especially pronounced in Russet varieties. As far as carryover ofespecially if glyphosate exposure occursdo find it, or somebody sees, a scout 2,4-D in seed, this hasnt been found.in the early- to mid-bulking stages. or whoever it is in the field, its really Dicamba is a little bit differentimportant to document it right away compound. Its becoming more and moreSS: How do you protect yourif you have a governmental agency that of an issue because of the increasingpotatoes against herbicide injury? will come and investigate too, that can amount of acres that dicamba is sprayedVB: I suggest that people maintain properalso be very important. As for me as an on during the growing season overpesticide application logs. In case ofextension specialist, my job is to educate dicamba-resistant crops. Dicamba causeslitigations, these spray logs are basicallyso I help growers understand whats going similar epinasty symptoms to 2,4-D, butrequired if youre going through litigation,on and what the problem is, but I have no symptoms usually will be more severe. or you want to protect yourself. Informauthority to enforce any laws or rules.In addition to 2,4-D symptoms, dicambathe neighbours, talk to them that you haveIts important to note these symptoms, can cause a fiddle neck appearance ata sensitive crop close to theirs and also beto contact the proper channels if needed, the top of the leaflets. At times, whenaware of what are the neighbouring crops,if something major is happening, because the dicamba amount is so high it willand it could help in the avoidance of theusually potatoes when theres injury, completely inhibit the growth of newproblem. theres a lot of money involved. And the leaves. As you go from 2,4-D to dicamba,What can be done if there is a seedreason why you document and sample and then you get into some of the group 4carryover that is suspected? One of theright away is because over time those herbicides with longer residuals, such asfirst things is to take photos and informinjury symptoms they will lessen, youll clopyralid, picloram, triclopyr. Symptomsthe certification officials, crop consultantsget new leaves sometimes grow over and from these herbicides are worse thanif you have any, and also the seed seller.symptoms might disappear as herbicide dicamba and have a greater longevity.Because they need to know that thereamounts lessen as plants break it down, Tubers can become malformed, pearhas been a possible suspicion here,and then suddenly it is difficult to find the shaped, elongated, etc. when plants areit is important to take the samples asinjury. Waiting a longer time will make exposed during early- to mid-bulking.soon as possible and get them analyzedit difficult to find herbicide residues in Glyphosate will translocate to thefor herbicide residues. With delay, thelaboratory testing. growing points, the newest leaves andherbicide residues may get diluted in a also down the tubers and roots. This isgrowing plant. Unfortunately, in many why the yellowing on the leaflets andcases, the resolution for detection is often the leaves are seen. Glyphosate willhigher than the levels which may still be also stunt the plant growth and reduceproducing symptoms in the field. For more information on herbicide injury visit https://overall production. Smaller leaves andspudsmart.com/herbicide-injury-on-potatoes-shorter internodes have been observed.AR: Something very important I thinka-spud-smart-roundtable-webinar-podcast/ and Tubers can become ugly and malformed,growers need to remember is when youwatch our latest webinar about it.SPUDSMART.COM Winter 202341'