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Pesticide
spray injury
Tom
Zabadal , MSU Horticulture |
| Home > Scouting guide> pesticide spray injury |
| Pesticide sprays
can cause brown spots on leaf tissues and fruit (see also Copper
Injury). Injury may be caused by a known incompatibility between
a specific variety and a particular pesticide (e.g., sulfur injury
on several grape varieties). An unknown incompatibility may result
from the variety being sprayed, the specific mix of pesticides,
the equipment being used or the weather conditions during spraying.
This injury typically occurs on the youngest leaves at the end of
shoots and often goes undetected until several days after the application.
By that time, several new leaves may have emerged at the shoot tips
so that the injury has a pattern of healthy leaves at the shoot
tip with injured leaves farther back on the shoot. |
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Pesticide
spray injury on a young, emerging leaf at the end of a shoot.
The injured leaf will continue to develop at an uneven rate,
becoming crinkled and misshapen.
Photo: T. Zabadal |
Some
sprays such as sulfur (injury shown above) may cause extensive
browning of mature leaves.
Photo: T. Zabadal |
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