# Tarspotter — Tar spot of Corn Forecaster

> Corn tar spot disease forecaster for fungicide management decisions. (iPhone/iPad app by UW-Madison Integrated Pest Management program.)

- Source: https://appshunter.io/ios/app/tarspotter/id1454584176 (this page in markdown: same URL + `.md`)
- Developer: [UW-Madison Integrated Pest Management program](https://appshunter.io/developer/455090091)
- Category: Business, Utilities
- Price: Free
- Rating: 3.50/5 from 2 App Store ratings
- Age rating: 4+
- Requires: iOS 15.0 · 2 MB
- Languages: English
- Released: 2021-05-11
- Data updated: 2026-06-10
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/tarspotter/id1454584176/reviews.md

## What is Tarspotter?

The purpose of Tarspotter is to assist farmers in making fungicide management decisions for tar spot disease on corn. The best time to manage tar spot is during V10 to R3 growth stage. Tar spot fungal spores which infect corn, leading to the development of tar spot. University research has indicated that the appearance of Tar spot fungus can be predicted using several variables including weather. Based on this research, models have been developed to forecast the risk of Tar spot fungus being present in a corn field. Farmers can easily input site-specific information about their corn field into this app, which combines this information with the research-based models to predict the best timing for tar spot treatment.
Tarspotter uses GPS coordinates to determine if weather has been favorable for the development of Tar spot fungus during corn flowering in a specific field. Models in the app use real-time weather to predict the dates of favorable conditions for most corn growing regions. Based on these predictions and crop phenology, a site-specific risk prediction is generated.

## Key features

- Fungicide management decisions
- Tar spot disease forecasting
- Site-specific risk prediction
- GPS-based weather analysis
- Corn growth stage integration
- Optimal treatment timing suggestions


## Frequently asked questions about Tarspotter

### What is Tarspotter used for?

Tarspotter assists farmers in making fungicide management decisions for tar spot disease on corn. It predicts the risk of infection and suggests optimal treatment timing based on weather and crop growth stages.

### How does Tarspotter predict tar spot risk?

The app uses GPS coordinates to gather site-specific weather data and applies university research-based models to forecast the risk of tar spot fungus development during critical corn growth stages.

### What corn growth stages are most important for Tarspotter?

Tarspotter focuses on the V10 to R3 growth stages of corn, which are identified as the most crucial periods for managing tar spot disease effectively.

### Is Tarspotter available on Android devices?

Based on the provided data, Tarspotter is available for iPhone and iPad. Device compatibility for Android is not specified.

### How often is Tarspotter updated?

The latest version of Tarspotter is 1.25, and it was last updated on April 30, 2023. This indicates a relatively recent update.

### What is the age rating for Tarspotter?

Tarspotter has an age rating of 4+, making it suitable for a wide range of users.

### Does Tarspotter have ads?

No, Tarspotter does not contain advertisements. The app is free to use without any ad interruptions.

### What is the user rating for Tarspotter?

Tarspotter has a rating of 3.5 stars based on 2 user ratings. This suggests a mixed but generally positive reception.

## Version history (last 5 releases)

### 1.25 — 2023-04-30

Version 1.25 includes various bug fixes and updates for increased accuracy.

### 1.24.3 — 2022-10-07

Minor bug fix causing crashes

### 1.24.2 — 2022-09-27

Bug fix for pull to refresh causing crashes.

### 1.24.1 — 2022-09-16

Minor bug fixes and improvements

### 1.24 — 2022-01-28

Fixed a bug causing fields in certain time zones to download weather incorrectly.

## Apps similar to Tarspotter

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Mix Matters Tool](https://appshunter.io/ios/app/mix-matters-tool/id1526584301) | 5.0 (14) | Free | Business |
| [Growers Edge Farm Manager](https://appshunter.io/ios/app/growers-edge-farm-manager/id1448378875) | 3.1 (20) | Free | Business |
| [Enlist Ahead](https://appshunter.io/ios/app/enlist-ahead/id646367167) | 4.2 (5) | Free | Business |
| [WinField United Smart Agronomy](https://appshunter.io/ios/app/winfield-united-smart-agronomy/id1638883102) | 5.0 (3) | Free | Business |
| [Taranis mobile](https://appshunter.io/ios/app/taranis-mobile/id1536572923) | 5.0 (2) | Free | Business |
| [Agronomy 365](https://appshunter.io/ios/app/agronomy-365/id1576848669) | 4.9 (50) | Free | Business |

## More apps by UW-Madison Integrated Pest Management program

- [N Price Calculator](https://appshunter.io/ios/app/n-price-calculator/id455090088)
- [Corn N Rate Calculator](https://appshunter.io/ios/app/corn-n-rate-calculator/id455298473)
- [IPM Toolkit](https://appshunter.io/ios/app/ipm-toolkit/id504685615)
- [Crop Calculators](https://appshunter.io/ios/app/crop-calculators/id692861569)
- [NPK Credits](https://appshunter.io/ios/app/npk-credits/id954888966)
- [Bean Cam](https://appshunter.io/ios/app/bean-cam/id1072670653)

All apps by UW-Madison Integrated Pest Management program: https://appshunter.io/developer/455090091

---

*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*