Home Products Desert Locust Situation Update (7th August, 2020)

Desert Locust Situation Update (7th August, 2020)

1. Desert Locust situation update

Current situation remains serious in Sindh along the Indo-Pakistan border where monsoon breeding is underway by spring-bred swarms. Also, substantial hatching and band formation are expected in August till early September and a second generation of summer breeding would start at the end of September. Extensive control operations are in progress in the affected areas. (Courtesy: Food and Agriculture Organization of United Nations, Locust Watch, 3rd August, 2020).

2. Impact of weather on Locust Growth

Monsoon rainfall is expected to remain near normal (+10%) during July to September 2020 in Pakistan. Sindh and Kashmir are likely to receive moderately above normal (+20%) rainfall during August and September.

Temperatures are expected to remain higher than the requisite criteria (>35 °C) in most parts of the lower half of the country. Higher temperatures may decrease the lifetime of Locust (below 6 months) and their activities may also be affected. Generally, winds are expected to prevail South-Westerly in lowland areas especially over the Sindh province (the vulnerable areas). These winds would push them away towards Indian side.

Apart from projected higher temperatures and wind pattern, higher rains would provide favorable environment for Locust breeding during monsoon season.

3. Precautionary Measures

Widespread and Appropriate insecticides spray using aero planes/helicopters or special vehicles in the affected areas, is the only solution to control the spread of locust.

Weather Based Locust Prediction Criteria

Parameters Threshold Outcome Remarks
Rainfall (mm) > 25 mm each in last two months Favorable for laying Eggs The weather conditions in the recent months favored the development and growth of Locust in the particular areas.
As per seasonal prediction, there would be conducive environment for the locust during the monsoon season, particularly in the lower and eastern parts of Sindh.
Air Temperature 20-35 °C Favorable for Egg and Hopper development
Soil Temperature (Shallow Depths) > 35 °C Generally, favorable for egg development
Wind Speed (Knots) <13.6 Knots for Adults
<19.4 Knots for Swarm to take off
  • Favorable for Adults to take off.
  • Favorable for Swarm to take off